uboat.net

  Front page - Fighting the U-boats - Allied Warships

Follow us on Twitter
@uboatnet

Notable events involving K XII include:

The page for this submarine was last updated in May 2018.

2 Dec 1941
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) departed Surabaya together with HrMs K IX (Lt.Cdr. P.G. de Back, RNN), HrMs K XI (Lt.Cdr. A.H. Deketh, RNN) and HrMs K XIII (Lt.Cdr. M.A.J. Derksema, RNN) (this is the 2nd Dutch submarine division) with the orders to patrol in Strait Karimata and Strait Gaspar.

7 Dec 1941
Before the war with Japan started the submarines of the 2nd submarine division, HrMs K XIII (Lt.Cdr. M.A.J. Derksema, RNN), HrMs K IX (Lt.Cdr. P.G. de Back, RNN), HrMs K XI (Lt.Cdr. A.H. Deketh, RNN) and HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) were ordered to proceed Northwards. K XI was ordered to patrol off the Natuna Islands. The other three submarines were ordered to patrol off the Badas Islands.

K IX however developed engine problems and was forced to return to Surabaya for repairs.

9 Dec 1941
All five Dutch submarines that are now operating under British control (1st submarine division; HrMs O 16 (Lt.Cdr. A.J. Bussemaker, RNN) and HrMs K XVII (Lt.Cdr. H.C. Besançon, RNN) and the 2nd submarine division; HrMs K XIII (Lt.Cdr. M.A.J. Derksema, RNN), HrMs K XI (Lt.Cdr. A.H. Deketh, RNN) and HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) are ordered to form a patrol line 180° from the South point of French Indo-China.

10 Dec 1941
While still en-route to their patrol area HrMs O 16 (Lt.Cdr. A.J. Bussemaker, RNN), HrMs K XVII (Lt.Cdr. H.C. Besançon, RNN), HrMs K XIII (Lt.Cdr. M.A.J. Derksema, RNN), HrMs K XI (Lt.Cdr. A.H. Deketh, RNN) and HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) are ordered to proceed towards the East coast of Malaya after they had reached their patrol position.

K XII reached her patrol position in the morning of 11 December and then proceeded towards the shore of Malaya. She arrived off Kota Bharu at daybreak on 12 December.

12 Dec 1941
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) torpedoed and sank the already damaged Japanese transport ship Awazisan Maru (9794 GRT, built 1939, sometimes also spelled as Awajisan Maru) off Kota Bharu, Malaya.

(All times are zone -7.5)
In the late afternoon a large merchant ship was sighted close inshore. K XII closed submerged in very shallow water.

1815 hours - Two 21" mk.II torpedoes were fired. No explosions however followed and it is thought the torpedoes might have got stuck in the mud. It was decided to close and attack again after dark.

1923 hours - Fired a 18" mk.IV torpedo. Another one was fired 6 minutes later. Both hit. As K XII was in very shallow water she made immediately for deeper water.

The Awajisan Maru had already been damaged by British Hudson aircraft on 8 December 1941. She was gutted with fire and had been abandoned.

13 Dec 1941
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) attacked a Japanese tanker off Kota Bharu. A hit was claimed.

The ship attacked was an engines aft transport which therefore looked like a tanker. The ship was the Japanese Toro Maru (1939 GRT, built 1939) which was sunk.

(All times are zone -7.5)
In the early morning hours K XII returned towards the shore and in the early afternoon a Japanese tanker was sighted.

1452 hours - Fired a 21" mk.II torpedo. The torpedo ran on the surface but non the less it hit the ship aft.

1458 hours - Fired another 21" mk.II torpedo. The results could not be observed as depth control was lost and K XII broached. She immediately dived again and cleared the area at speed to make for deeper water.

It is not known what ship was attacked and hit by K XII.

14 Dec 1941
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) set course towards Singapore. Early in the afternoon she had an encounter with HrMs K XVII (Lt.Cdr. H.C. Besançon, RNN). They informed them about a signal K XII had missed and that she had to take up a patrol position 310°, Pulau Mankai, 20 nautical miles. K XII arrived in this position early in the evening.

15 Dec 1941
Around noon HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) set course to close the shore of Malaya as she had been ordered to do by signal.

Early in the evening course was set (as ordered) towards Singapore.

16 Dec 1941
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) arrived at Singapore thus ending her 1st war patrol. Small repairs were undertaken and 6 new torpedoes were taken on board.

21 Dec 1941
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) departed Singapore for her 2nd war patrol. She was ordered to patrol to the North of the Anambas Islands.

25 Dec 1941
In the evening HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) is ordered to proceed to position 04°29'N, 106°03'E to search for survivors of a British Catalina aircraft that was shot down by a Japanese aircraft.

26 Dec 1941
At 0330 hours (zone -7.5) HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) picked up 9 survivors of the British Catalina aircraft. As all survivors were injured course was set to return to Singapore.

27 Dec 1941
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) ended her 2nd war patrol at Singapore.

30 Dec 1941
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) departed Singapore for her 3rd war patrol. She was ordered to patrol to the North of Kuching, Borneo.

11 Jan 1942
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) ended her 3rd war patrol at Singapore.

18 Jan 1942
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) departed Singapore for Surabaya.

23 Jan 1942
While en-route from Singapore to Surabaya HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) is ordered to take up a patrol position in the Southern entrance to the Makassar Strait making this her 4th war patrol.

31 Jan 1942
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) ended her 4th war patrol at Surabaya.

6 Feb 1942
After small repairs HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) departed Surabaya for her 5th war patrol. She is ordered to patrol to the North-West of Billiton.

10 Feb 1942
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) arrived in her patrol area.

14 Feb 1942
The port diesel engine of HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) became defective. A signal is sent to base to report the situation. K XII is then ordered to return to Surabaya for repairs.

20 Feb 1942
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) ended her 5th war patrol at Surabaya.

1 Mar 1942
After repairs HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) departed Surabaya. She was ordered to stay outside the harbour and to be ready to evacuate members of the naval staff to Colombo.

6 Mar 1942
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) departed Surabaya roads for Colombo. She had on board 7 members of the naval staff.

8 Mar 1942
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) tried to pass through either Strait Bali, Strait Lombok or Strait Atlas but Japanese destroyers were sighted patrolling at all places. It was decided to postpone the passage and if it proved to be impossible to pass the above mentioned Strait's to pass through Stait Sape.

10 Mar 1942
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) passed through Strait Sape Southbound. As there was now not enough fuel on board to make Colombo. It was decided to make for Fremantle, Australia.

20 Mar 1942
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) arrived at Fremantle.

20 Apr 1942
HrMs K IX (Lt. T. Brunsting, RNN) and HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) departed Fremantle for Sydney. They were escorted by HrMs Abraham Crijnssen (Lt. A. van Miert, RNN). (1)

12 May 1942
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) arrived at Sydney after stopovers at Adelaide and Melbourne. At Sydney she is to be refitted by the Cockatoo Docks and Engineering Co. Ltd.

26 May 1942
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) is docked at Sydney.

17 Jun 1942
HrMs K XII (Lt.Cdr. H.C.J. Coumou, RNN(R)) is undocked.

14 Aug 1942
HrMs K XII (Lt. T. Brunsting, RNN) ended her refit at Sydney and commenced a short period of trials.

21 Aug 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) departed Sydney for Darwin.

28 Aug 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) made a short stop at Cairns. She departed later the same day to continue her passage to Darwin.

4 Sep 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) arrived at Darwin. En route serveral exercises were held in landing operations. These were continued while at Darwin.

7 Sep 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) departed Darwin for her 6th war patrol. She was to land a party on the South coast of Java.

14 Sep 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) landed a party of three at the Radjeswesi Bay on the South coast of Java. Unfortunately in the surf the small boat of K XII sank and a rubber boat capsized. Nearly all stores were lost. The three members of the party and the two crewmembers of the K XII (that were in the small boat of K XII) reached the shore. They were all taken off the next day and the landing of the party was abandoned as nearly all their stores were now on the bottom of the bay.

21 Sep 1942
In the early morning hours HrMs K XII (Lt.Cdr. T. Brunsting, RNN) is bombed by mistake by a Catalina flying boat. No damage was done to K XII.

23 Sep 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) ended her 6th war patrol at Fremantle.

20 Oct 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted trials off Fremantle. (2)

23 Oct 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted sound tests off Fremantle. (2)

28 Oct 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted trials off Fremantle. (2)

4 Nov 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted trials off Fremantle. (2)

7 Nov 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted trials off Fremantle. (2)

10 Nov 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) departed Fremantle to conduct exercises to the South of Fremantle. (2)

17 Nov 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) returned to Fremantle upon completion of her exercise program.

Later the same day she departed Fremantle for her 7th war patrol. She was ordered to land two party's on the South coast of Java. (2)

21 Nov 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) arrived at Exmouth Gulf to take on board fuel, water and fresh supplies. She departed for the South coast of Java later the same day.

27 Nov 1942
In the evening HrMs K XII (Lt.Cdr. T. Brunsting, RNN) landed party 'Tiger II' (3 men) on the South coast of Java in the Serang Bay. The 4th member of the party remained on board the submarine and it was intended to land him the following night with the radio set, however no contact with the party could be established.

After landing party 'Tiger I' K XII returned to the Serang Bay and tried to establish contact until 6 December when course was set to return to Fremantle.

30 Nov 1942
In the evening HrMs K XII (Lt.Cdr. T. Brunsting, RNN) landed party 'Tiger I' (3 men and supplies) on the South coast of Java in the Prigi Bay.

11 Dec 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) made a short stop at Exmouth Gulf. She departed for Fremantle later the same day.

16 Dec 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) ended her 7th war patrol at Fremantle. At Fremantle she is refitted by USS Pelias. (2)

22 Dec 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) is put on the slip at Fremantle. (2)

27 Dec 1942
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) is put back in the water. (2)

12 Jan 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted trials off Fremantle. Upon completion of these trials A/S exercises were carried out with HMAS Dubbo (T/Lt. N.G. Weber, RANR(S)). (2)

21 Jan 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) departed Fremantle for her 8th war patrol. She was ordered to land a party (Tiger III) on the South coast of Java and to contact party's Tiger I and II in the Serang Bay.

25 Jan 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) arrived at Exmouth Gulf.

26 Jan 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) departed Exmouth Gulf for the South coast of Java.

6 Feb 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) succesfully contacted party's 'Tiger I' and 'Tiger II' at Serang Bay. Shorty afterwards the party's signalled that there was danger and the K XII was to leave the area.

7 Feb 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) again tried to contact party's 'Tiger I' and 'Tiger II' at the Serang Bay but nothing was sighted.

9 Feb 1943
In the evening HrMs K XII (Lt.Cdr. T. Brunsting, RNN) landed party 'Tiger III' (only one person) in Tapen Bay.

22 Feb 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) ended her 8th war patrol at Fremantle. At Fremantle she is refitted by USS Pelias. (2)

26 Mar 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted trials off Fremantle. (2)

31 Mar 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted exercises off Fremantle together with USS Isabel (Lt. F.D. Buckley, USN). (2)

3 Apr 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted sound tests off Fremantle. (2)

16 Apr 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) departed Fremantle for her 9th war patrol. She was ordered to land two party's (Tiger IV and Tiger V) on the South-East coast of Java and to contact party's Tiger I, II and III.

20 Apr 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) arrived at Exmouth Gulf to take on board fuel and fresh water.

21 Apr 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) departed Exmouth Gulf for Java.

27 Apr 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) arrived at a rendez-vous near Pulau Sempu off the South coast of Java. Three days were spent in the area but no sailing vessel turned up.

1 May 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) arrived at a rendez-vous at the Pang Pang Bay on the South-East coast of Java. Again nothing was sighted.

3 May 1943
In the early hours of 3 May 1943 HrMs K XII (Lt.Cdr. T. Brunsting, RNN) landed party 'Tiger IV' (only one person) at the Pang Pang Bay.

4 May 1943
In the early hours of 4 May 1943 HrMs K XII (Lt.Cdr. T. Brunsting, RNN) landed party 'Tiger V' (only one person) at the Pang Pang Bay.

5 May 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) passed Lombok Strait Northbound.

6 May 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) arrived at a rendez-vous off Pulau Goa Goa. No sailing vessel however turned up and K XII departed the area for Fremantle late on the 8th.

15 May 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) arrived at Exmouth Gulf. She departed later on the same day for Fremantle.

19 May 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) ended her 9th war patrol at Fremantle. This was the last operation war patrol of K XII, she suffered from many defects due to her age and lack of spare parts. She was now assigned to A/S training duties.

Following her arrival at Fremantle repairs were undertaken by Submarine Repair Unit 137 and the USS Otus. (2)

29 Jun 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted trials off Fremantle. (2)

4 Jul 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted trials off Fremantle. (2)

10 Jul 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted trials off Fremantle. (2)

14 Jul 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNethN) conducted A/S exercises off Fremantle with HrMs Van Galen (Lt.Cdr. F.T. Burghard, RNethN). (3)

15 Jul 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Dubbo (T/Lt. N.G. Weber, RANR(S)). (2)

21 Jul 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Horsham (T/Lt. W.H. Newby, RANR(S)). (2)

22 Jul 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNethN) conducted A/S exercises off Fremantle with HrMs Tromp (Capt. J.B. de Meester, RNethN) and HrMs Tjerk Hiddes (Lt.Cdr. W.J. Kruys, RNethN). (4)

23 Jul 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted exercises off Fremantle together with USS Isabel. (2)

26 Jul 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS SC-739. (2)

28 Jul 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Horsham (T/Lt. W.H. Newby, RANR(S)). (2)

29 Jul 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNethN) conducted A/S exercises off Fremantle with HrMs Van Galen (Lt.Cdr. F.T. Burghard, RNethN). (3)

30 Jul 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) collided with an Australian tug inside Fremantle harbour. (2)

6 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) is put on the slipway to repair the damage she sustained on 30 July 1943. (2)

11 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) is put back in the water. (2)

13 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted trials off Fremantle. (2)

13 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted trials off Fremantle. (2)

16 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Dubbo (T/Lt. N.G. Weber, RANR(S)). (2)

17 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS SC-739. (2)

18 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNethN) conducted A/S exercises off Fremantle with HrMs Tjerk Hiddes (Lt.Cdr. W.J. Kruys, RNethN). (5)

19 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS SC-739. (2)

20 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Horsham (T/Lt. W.H. Newby, RANR(S)). (2)

23 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HrMs Tjerk Hiddes (Lt.Cdr. W.J. Kruys, RNN). Also radar exercises were carried out with aircraft. (2)

23 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNethN) conducted A/S exercises off Fremantle with HrMs Tjerk Hiddes (Lt.Cdr. W.J. Kruys, RNethN). (5)

24 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with aircraft. (2)

25 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Dubbo (T/Lt. N.G. Weber, RANR(S)). Also radar exercises were carried out with aircraft. (2)

26 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Horsham (T/Lt. W.H. Newby, RANR(S)). Also radar exercises were carried out with aircraft. (2)

27 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS Lark. (2)

30 Aug 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Horsham (T/Lt. W.H. Newby, RANR(S)). (2)

2 Sep 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS SC-739. (2)

3 Sep 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Dubbo (T/Lt. N.G. Weber, RANR(S)). (2)

6 Sep 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Horsham (T/Lt. W.H. Newby, RANR(S)). (2)

8 Sep 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNethN) conducted A/S exercises off Fremantle with HrMs Tjerk Hiddes (Lt.Cdr. W.J. Kruys, RNethN). (5)

9 Sep 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNethN) conducted A/S exercises off Fremantle with HrMs Van Galen (Lt.Cdr. F.T. Burghard, RNethN).

Later the same day, around 2230H/9, HrMs Van Galen to make rendezvous with the transport Tai Ping Yang (Panamanian, 6856 GRT, built 1929).

Shortly after departure (around 2345H/9) the transport was encountered as she was apparently early in her arrival and course was set for Gage Roads where they arrived not long afterwards. (6)

13 Sep 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Dubbo (T/Lt. N.G. Weber, RANR(S)). (2)

14 Sep 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with the Dutch light cruiser HrMs Tromp (Capt. J.B. de Meester, RNN). (7)

16 Sep 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with aircraft. (2)

17 Sep 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS Isabel. (2)

27 Sep 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS Isabel. (2)

28 Sep 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Horsham (T/Lt. W.H. Newby, RANR(S)). (8)

29 Sep 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS SC-739. (2)

30 Sep 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS Isabel. (2)

1 Oct 1943
HrMs O 21 (Lt.Cdr. J.F. van Dulm, RNethN) and HrMs K XII (Lt.Cdr. T. Brunsting, RNethN) conducted attack and A/S exercises off Fremantle with HrMs Tjerk Hiddes (Lt.Cdr. W.J. Kruys, RNethN) (9)

4 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Dubbo (T/Lt. N.G. Weber, RANR(S)). (2)

6 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS Whippoorwill. (2)

7 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Horsham (T/Lt. W.H. Newby, RANR(S)). (2)

8 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HrMs Jacob van Heemskerck (Capt. W. Harmsen, RNN). (2)

11 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS SC-739. (2)

12 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS Isabel. (2)

13 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Dubbo (T/Lt. N.G. Weber, RANR(S)). (2)

15 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Horsham (T/Lt. W.H. Newby, RANR(S)). (2)

18 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Horsham (T/Lt. W.H. Newby, RANR(S)). (2)

19 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS SC-739. (2)

20 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with HMAS Dubbo (T/Lt. N.G. Weber, RANR(S)). (2)

21 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted radar exercises with HrMs Van Galen (Lt.Cdr. F.T. Burghard, RNN) and A/S exercises off Fremantle with USS SC-739. (2)

22 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS Whippoorwill and HrMs O 21 (Lt.Cdr. J.F. van Dulm, RNN). (2)

25 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted exercises off Fremantle. (2)

26 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle together with USS William B. Preston. (2)

27 Oct 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle together with USS William B. Preston.

K XII commenced a repair and refit period upon returning to Fremantle after these exercises. (2)

1 Dec 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with aircraft. (2)

9 Dec 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with aircraft. (2)

10 Dec 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with aircraft. (2)

16 Dec 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with aircraft. (2)

17 Dec 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with aircraft. (2)

23 Dec 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with aircraft. (2)

24 Dec 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with aircraft. (2)

29 Dec 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle together with USS Chanticleer (Cdr. R.E. Hawes, USN). (2)

30 Dec 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with aircraft. (2)

31 Dec 1943
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with aircraft. (2)

14 Jan 1944
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with aircraft. (2)

19 Jan 1944
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS SC-739. (2)

20 Jan 1944
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with aircraft. (2)

21 Jan 1944
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with aircraft. (2)

22 Jan 1944
HrMs K XII (Lt.Cdr. T. Brunsting, RNN) conducted A/S exercises off Fremantle with USS SC-739.

HrMs K XII was suffering from more and more defects due to her old age. Repairs were again undertaken but the boat was not used for exercises after this day. (2)

10 Mar 1944
HrMs K XII (Lt. Baron J.H. Mackay, RNN) departed Fremantle for her 10th war patrol. She was ordered to patrol off Fremantle (the reason for this patrol is not known to us but a Japanese cruiser force was on a raiding mission in the Indian Ocean and it is possible that this was the reason).

Part of the crew had already been sent to Melbourne and was substituted by men from the USN. (2)

14 Mar 1944
HrMs K XII (Lt. Baron J.H. Mackay, RNN) ended her 10th war patrol at Fremantle. (2)

22 Mar 1944
HrMs K XII (Lt. Baron J.H. Mackay, RNN) departed Fremantle for Melbourne. (2)

1 Apr 1944
HrMs K XII (Lt. Baron J.H. Mackay, RNN) arrived at Melbourne. (2)

7 Apr 1944
HrMs K XII (Lt. Baron J.H. Mackay, RNN) departed Melbourne for Sydney. From 7 April to 10 April HrMs K XII was escorted by HMAS Lithgow (T/Lt. C.T.G. Haultain, RANR(S)). From 11 April to 12 April HrMs K XII was escorted by HMAS Kybra (T/Lt. R.V.A. Corbett, RANR(S)) and two motor launches. (2)

12 Apr 1944
HrMs K XII (Lt. Baron J.H. Mackay, RNN) arrived at Sydney where she was decommissioned on 5 May 1944 and laid up. (2)