Adua (AD)
Adua

Type	Coastal / Sea going
Class	Adua (23)
Laid down	1 Feb 1936	Cantieri Riuniti dell'Adriatico, Monfalcone
Launched	13 Sep 1936
Commissioned	14 Nov 1936
End service
Stricken
Loss date	30 Sep 1941
Loss position	37° 10'N, 0° 56'E
History
Fate	Sunk on 30th September 1941 off the North African Coast between Oran and Algiers in position 37°10'N, 00°56'E by depth charges from the destroyers HMS Legion and HMS Gurkha.

Commands

Commander	Date from	Date to	Command notes
T.V. Giuseppe Roselli Lorenzini	15 Feb 1940	8 Oct 1940
T.V. Carlo Todaro	9 Oct 1940	16 Jan 1941
C.C. Mario Resio	17 Jan 1941	28 Feb 1941
T.V. Luigi Riccardi	28 Feb 1941	21 Apr 1941
T.V. Gaetano Iaccarino	21 Apr 1941	22 Apr 1941
T.V. Luigi Riccardi	23 Apr 1941	30 Sep 1941

Ships hit

No ships hit by this submarine.

Patrols and events

	Commander	Date	Time	Port	Arr. date	Arr. time	Arr. port	Miles	Description
1	Roselli Lorenzini, Giuseppe	9 Jun 1940	1655	Cagliari	21 Jun 1940	1404	Cagliari	1080	Sailed to form a patrol line (S2) on the Cape Teulada meridian: Axum - 15 miles south of the Cape. Turchese - 35 miles south of the Cape. Adua - 55 miles south of the Cape. Aradam - 75 miles south of the Cape. Later ordered to the West of Majorca and between Ibiza and Majorca.
		17 Jun 1940	0228	(0) Between Dragonera (Mallorca) and Formentara (Ibiza.	At 0228 hours, a destroyer was sighted at a distance of 4,000 metres. As visibility conditions were excellent, this prevented a surface attack. Adua submerged using the Roveto system at a depth of 30 metres and noises from two vessels were heard on the hydrophones. The submarine returned to periscope depth at 0600 hours.
		17 Jun 1940	0712	38° 40'N, 1° 40'E	At 0625 hours, a periscope scan of the horizon revealed several smokes. This was a French convoy consisting of a 10-15,000-ton liner, four 1-3,000-ton vessels escorted by a sloop of the ANCRE class. At 0712 hours, a single torpedo (533mm) was fired from a stern tube at a range of 1,800 metres aimed at the liner. The submarine was then only 300 metres from one of the smaller merchant vessels and disengaged quickly. At 0714 hours, an explosion was heard and it was believed that the target had been hit. The torpedo had actually missed and does not appear to have been observed. This was convoy IR2F of five ships, Florida (9,146 GRT, built 1926), Kita (3,894 GRT, built 1927), Edéa (3,747 GRT, built 1936), Medie II (5,078 grt, built 1922), Djebel Aurès (2,960 GRT, built 1930) escorted by Commandant Bory and La Curieuse. The same that was attacked by Provana. At 0757 hours, the submarine returned to periscope depth and observed the smaller merchant ships disappearing in the distance while the liner flanked by the sloop were at a distance of 6,000 metres. At the same time, two destroyers of the BISON class were seen at a distance of 4.000 metres rushing to the aid of the convoy. Adua was too far to attack and went down to 40 metres.
	Roselli Lorenzini, Giuseppe	29 Jun 1940	1009	Cagliari	30 Jun 1940	1527	Palermo	229	Passage Cagliari-Messina (to Monfalcone for engine overhaul) but diverted to Palermo due to engine defects. An ULTRA intercept mentioned that she had a damaged motor and would be arriving at Point A of Messina at 1130 hours on the 30th. This may have actually referred to point A of Palermo.
	Roselli Lorenzini, Giuseppe	3 Jul 1940	1956	Palermo	7 Jul 1940	0810	Pola	766	Passage Palermo-Pola.
	Roselli Lorenzini, Giuseppe	9 Jul 1940	1157	Pola	9 Jul 1940	2005	Monfalcone	82	Passage Pola-Monfalcone, escorted by the auxiliary San Giusto. Then refit. From October 1940, she was affected to the submarine training school in Pola.
	Roselli Lorenzini, Giuseppe	28 Sep 1940	0926	Monfalcone	28 Sep 1940	1447	Monfalcone	50,5	Trials.
	Roselli Lorenzini, Giuseppe	4 Oct 1940	1354	Monfalcone	4 Oct 1940	1635	Monfalcone	20,3	Diving trials with the submarines Galatea and Fisalia, escorted by tug Morrhua.
	Roselli Lorenzini, Giuseppe	6 Oct 1940	1100	Monfalcone	6 Oct 1940	1810	Pola	77,4	Passage Monfalcone-Pola.
	Todaro, Carlo	9 Oct 1940	0750	Pola	9 Oct 1940	1440	Fiume	64,5	Passage Pola-Fiume.
	Todaro, Carlo	12 Oct 1940	0800	Fiume	12 Oct 1940	1352	Fiume	20,2	Exercises, escorted by the auxiliary Nettuno.
	Todaro, Carlo	14 Oct 1940	0805	Fiume	14 Oct 1940	1440	Pola	62,5	Passage Fiume-Pola.
	Todaro, Carlo	23 Oct 1940	0806	Pola	23 Oct 1940	1730	Pola	63,5	Exercises.
	Todaro, Carlo	25 Oct 1940	0800	Pola	25 Oct 1940	1618	Pola	10	Gyrocompass tests.
	Todaro, Carlo	31 Oct 1940	0754	Pola	31 Oct 1940	1730	Pola	64,7	Exercises, escorted by the auxiliary Morrhua.
	Todaro, Carlo	4 Nov 1940	0800	Pola	4 Nov 1940	1730	Pola	17,2	Exercises, escorted by the auxiliary Morrhua.
	Todaro, Carlo	6 Nov 1940	0810	Pola	6 Nov 1940	1715	Pola	41,5	Exercises, escorted by the auxiliary Morrhua.
	Todaro, Carlo	8 Nov 1940	0800	Pola	8 Nov 1940	1237	Pola	42,5	Exercises, escorted by the auxiliary Morrhua.
	Todaro, Carlo	11 Nov 1940	0810	Pola	11 Nov 1940	1730	Pola	43,3	Exercises, escorted by the auxiliary Morrhua.
	Todaro, Carlo	13 Nov 1940	0735	Pola	13 Nov 1940	1732	Pola	17	Exercises with the tug Tenace.
	Todaro, Carlo	15 Nov 1940	0800	Pola	15 Nov 1940	1732	Pola	16,5	Exercises with the tug Tenace.
	Todaro, Carlo	20 Nov 1940	0805	Pola	20 Nov 1940	1742	Pola	42,7	Exercises with the tug Tenace.
	Todaro, Carlo	21 Nov 1940	0806	Pola	21 Nov 1940	1723	Pola	48,7	Exercises, escorted by the auxiliary Marittimo.
	Todaro, Carlo	23 Nov 1940	0810	Pola	23 Nov 1940	1748	Pola	42,5	Sailed with the submarine Fisalia, escorted by the auxiliaries San Giorgio and Tenace, for torpedo firing exercises with the torpedo boat Audace.
	Todaro, Carlo	25 Nov 1940	0756	Pola	25 Nov 1940	1700	Pola	41,5	Sailed with the submarine Des Geneys, escorted by the auxiliaries San Giorgio and Tenace, for torpedo firing exercises with the torpedo boat Audace.
	Todaro, Carlo	27 Nov 1940	0805	Pola	27 Nov 1940	1712	Pola	41	Sailed with the submarine Des Geneys, escorted by San Giorgio and Tenace for torpedo firing exercises with the torpedo boat Audace.
	Todaro, Carlo	28 Nov 1940	0800	Pola	28 Nov 1940	1712	Pola	49,8	Sailed with the submarine Fisalia, escorted by the auxiliaries San Giorgio and Tenace for torpedo firing exercises with the torpedo boat Audace.
	Todaro, Carlo	4 Dec 1940	0807	Pola	4 Dec 1940	1747	Pola	46,5	Torpedo firing exercises with the torpedo boat Audace, escorted by the tug Tenace.
	Todaro, Carlo	9 Dec 1940	0808	Pola	9 Dec 1940	1800	Pola	51,6	Exercises with the submarine Galatea, escorted by the tug Tenace for simulated attacks on the torpedo boat Audace.
	Todaro, Carlo	13 Dec 1940	0803	Pola	13 Dec 1940	1803	Pola	47,2	Exercises with the submarine Galatea, escorted by the sloop Diana.
	Todaro, Carlo	15 Dec 1940	0810	Pola	15 Dec 1940	1703	Pola	46,8	Exercises, escorted by the auxiliary Gigliola.
	Todaro, Carlo	16 Dec 1940	0830	Pola	16 Dec 1940	1645	Pola	44,5	Attack exercises with the torpedo boat Audace, escorted by the auxiliary Gigliola.
	Todaro, Carlo	20 Dec 1940	0807	Pola	20 Dec 1940	1810	Pola	43,5	Sailed with the submarine Des Geneys, escorted by the auxiliary Gigliola for torpedo firing exercises with the torpedo boat Audace.
	Todaro, Carlo	24 Dec 1940	0817	Pola	24 Dec 1940	1505	Pola	41	Exercises with the submarine Fisalia, escorted by the torpedo boat Audace.
	Todaro, Carlo	26 Dec 1940	0800	Pola	26 Dec 1940	1830	Pola	49	Attack exercises with the submarines Bragadino and Des Deneys on the torpedo boat Audace, escorted by the auxiliary San Giorgio and the submarine chaser Laurana.
	Todaro, Carlo	28 Dec 1940	1600	Pola	29 Dec 1940	0220	Pola	70,5	Sailed with the submarine Des Geneys for night torpedo firing exercises with the torpedo boat Audace.
	Todaro, Carlo	30 Dec 1940	0805	Pola	30 Dec 1940	1810	Pola	48,5	Sailed with the submarine Bragadino, escorted by the auxiliary Jadera, for torpedo firing exercises with the torpedo boat Audace.
	Todaro, Carlo	2 Jan 1941	0823	Pola	2 Jan 1941	1715	Pola	59,5	Sailed with the submarine Pisani, escorted by the auxiliary Jadera, for attack exercises on the torpedo boat Audace.
	Todaro, Carlo	4 Jan 1941	0818	Pola	4 Jan 1941	1630	Pola	56,8	Exercises with the submarine Pisani, escorted by the auxiliary Laurana.
	Todaro, Carlo	6 Jan 1941	0807	Pola	6 Jan 1941	1715	Pola	54,8	Exercises with the submarine Des Geneys, escorted by the submarine chaser Laurana.
	Todaro, Carlo	7 Jan 1941	0804	Pola	7 Jan 1941	1413	Pola	27,5	Gunfire exercises with the submarines Bragadino, Des Geneys and Fisalia, escorted by the auxiliary Laurana.
	Todaro, Carlo	11 Jan 1941	0804	Pola	12 Jan 1941	0045	Pola	58,5	Attack exercises with the submarine Des Geneys on the torpedo boat Audace, escorted by the auxiliary San Giorgio.
	Todaro, Carlo	13 Jan 1941	0800	Pola	13 Jan 1941	1642	Leme Channel	32,5	Passage Pola-Leme Channel and exercises with the submarines Fieramosca, Fisalia and Pisani. Escorted by torpedo boat Audace and the auxiliary San Giorgio.
	Todaro, Carlo	14 Jan 1941	0800	Leme Channel (Rovigno)	15 Jan 1941	0840	Pola	51	Passage Leme Channel-Pola, and exercises with the torpedo boat Audace and the submarines Pisani, Fieramosca and Fisalia.
	Resio, Mario	18 Jan 1941	1608	Pola	19 Jan 1941	0255	Pola	64,5	Sailed with the submarines Des Geneys and Bragadino, escorted by the auxiliary San Giorgio for torpedo firing exercises with the torpedo boat Audace.
	Resio, Mario	20 Jan 1941	0805	Pola	21 Jan 1941	0210	Pola	71,5	Exercises with the submarine Bragadino, escorted by the auxiliaries Jadera, Volta, Audace and Laurana.
	Resio, Mario	24 Jan 1941	0800	Pola	24 Jan 1941	1748	Pola	51,8	Sailed with submarine Des Geneys for torpedo firing exercises with torpedo boat Audace, escorted by the auxiliary Laurana.
	Resio, Mario	28 Jan 1941	0910	Pola	28 Jan 1941	1745	Pola	55,5	Sailed with the submarines Bragadino and Fisalia, for torpedo firing exercises with the sloop Diana.Escorted by the auxiliaries San Giorgio and Jadera.
	Resio, Mario	29 Jan 1941	0824	Pola	29 Jan 1941	1751	Pola	27,5	Exercises, escorted by the auxiliary San Giorgio.
	Resio, Mario	31 Jan 1941	0810	Pola	31 Jan 1941	1740	Pola	51	Attack exercises on the torpedo boat Audace, escorted by the auxiliaries Jadera and San Giorgio.
	Resio, Mario	3 Feb 1941	0842	Pola	3 Feb 1941	1741	Pola	19,5	Exercises, escorted by the tug Tenace.
	Resio, Mario	5 Feb 1941	0835	Pola	5 Feb 1941	1812	Pola	48	Exercises with the submarine Fisalia, escorted by the auxiliary Jadera.
	Resio, Mario	6 Feb 1941	0859	Pola	6 Feb 1941	1708	Pola	7	Exercises with the Tug 95.
	Resio, Mario	16 Feb 1941	0938	Pola	16 Feb 1941	1640	Pola	53	Sailed with the submarines Fisalia and Bragadino, for torpedo firing exercises with the torpedo boat Audace. Escorted by the auxiliaries Laurana and Jadera.
	Resio, Mario	18 Feb 1941	0846	Pola	18 Feb 1941	1717	Pola	26	Exercises, escorted by the auxiliary Jadera.
	Resio, Mario	19 Feb 1941	0815	Pola	19 Feb 1941	1447	Pola	44	Exercises with the submarine Fisalia, escorted by the auxiliaries San Giorgio and Jadera and the torpedo boat Audace.
		19 Feb 1941	AM	(0) Off Pola.	During the morning, Adua was exercising with the submarine Fisalia and the torpedo boat Audace. Fisalia detected a suspected submarine and this was confirmed by Adua, The two submarines returned to Pola while Audace remained behind to hunt the submarine. The contact was bogus. No Allied submarines operated in the area.
	Resio, Mario	21 Feb 1941	0920	Pola	21 Feb 1941	1715	Pola	50	Exercises with the submarine Fisalia, escorted by the auxiliary San Giorgio.
	Resio, Mario	22 Feb 1941	0849	Pola	22 Feb 1941	1732	Pola	44	Sailed with the submarine Pisani for torpedo firing exercises with the torpedo boat Audace. Escorted by the auxiliaries San Giorgio and Jadera.
	Resio, Mario	24 Feb 1941	0835	Pola	24 Feb 1941	1805	Pola	45	Sailed with the submarines Fisalia and Pisani for torpedo firing exercises with the torpedo boat Audace. Escorted by the auxiliaries San Giorgio and Jadera.
	Resio, Mario	25 Feb 1941	1112	Pola	25 Feb 1941	1654	Pola	41,5	Attack exercises with the submarine Fisalia on the light cruiser Bari. Escorted by the auxiliary Laurana.
	Resio, Mario	28 Feb 1941	0812	Pola	28 Feb 1941	1747	Pola	12,5	Sailed with the submarine Balilla for torpedo firing exercises with the torpedo boat Audace. Escorted by the auxiliaries San Giorgio and Jadera.
	Riccardi, Luigi	1 Mar 1941	0830	Pola	1 Mar 1941	1626	Pola	45	Exercises with the submarine Toti, Bragadino and Fisalia. Escorted by the torpedo boat Audace and the auxiliary Jadera.
	Riccardi, Luigi	3 Mar 1941	1745	Pola	4 Mar 1941	0145	Pola	57,5	Sailed with the submarine Balilla for night torpedo firing exercises with Audace. Escorted by the auxiliary San Giorgio.
	Riccardi, Luigi	12 Mar 1941	0030	Pola	14 Mar 1941	1145	Taranto	506	Passage Pola-Taranto. Uneventful.
	Riccardi, Luigi	22 Mar 1941	1120	Taranto	22 Mar 1941	1717	Taranto	26,5	Exercises.
2	Riccardi, Luigi	22 Mar 1941	2112	Taranto	23 Mar 1941	1010	Taranto	84	Hydrophone patrol off Taranto. Uneventful.
3	Riccardi, Luigi	26 Mar 1941	1200	Taranto	26 Mar 1941	2033	Gallipoli	63,5	Passage Taranto-Gallipoli.
3b	Riccardi, Luigi	29 Mar 1941	2255	Gallipoli	9 Apr 1941	1636	Taranto	1004,2	Patrolled in Adriatic within 10 miles of 39°20'N, 19°30'E, on line 150° - 330° during the day and 065° - 245° during the night. The submarine was informed that, at 0600 hours on 6th April, a state of war existed with Yugoslavia.
	Riccardi, Luigi	10 Apr 1941	1400	Taranto	10 Apr 1941	1643	Taranto	6,7	Exercises.
4	Iaccarino, Gaetano	21 Apr 1941	2030	Taranto	22 Apr 1941	1120	Taranto	93,1	Defensive patrol off Taranto in 170° - Cape San Vito - 35 miles. Uneventful.
5	Riccardi, Luigi	24 Apr 1941	1200	Taranto	11 May 1941	1538	Portolago (Leros)	1731,1	Passage Taranto-Leros and patrol. Uneventful.
	Riccardi, Luigi	18 May 1941	0800	Portolago (Leros)	18 May 1941	1014	Portolago (Leros)	3,6	Exercises.
6	Riccardi, Luigi	24 May 1941	1830	Portolago (Leros)	7 Jun 1941	0644	Taranto	1451,7	Patrolled between Alexandria and Crete in 34°40', 24°50'E or Grids 2449 and 1649, then transferred to Taranto.
		29 May 1941	0350	(0) Off Cape Littinos (Crete).	At 0350 hours, dark shapes were seen in the distance. Adua steered toward them and sighted one cruiser and three destroyers proceeding at 26 knots at a distance of 9,000 metres. The submarine could only close to 6,000 metres and, at 0415 hours, gave up the chase and made an enemy report. These were probably the destroyers HMAS Napier, HMS Kandahar, HMS Kelvin and HMAS Nizam who had just embarked 744 troops from the fishing village of Skafia.
		31 May 1941	0340	(0) Messara Bay.	At 0340 hours, two destroyers were sighted at a distance of 8,000 metres. They passed out of range.
		31 May 1941	1025	(0) Messara Bay.	At 1025 hours, a merchant vessel was sighted but again the submarine could not close the range.
		3 Jun 1941	0130	(0) Off Cape Littinos (Crete).	At 0130 hours, Adua stopped a small barge carrying British soldiers. She took eight British prisoners on board and ordered the remainder to turn back. This was the British Army barge A.2 under Captain J.B. Fitzhardinge, Artillery, with 72 British soldiers (some sources say 75) trying to flee from Heraklion to Alexandria. It actually included four airmen of a Maryland II bomber (24 Squadron SAAF) which had been shot down over Maleme airfield. Ordered to swim to the submarine, the pilot Lt. E.G. Ford (SAAF) was captured but the co-pilot 2nd Lieutenant G.L.W. Gill drowned. Although the barge was ordered back, it eventually changed course and thanks to a small compass carried by Sergeant McWilliam (SAAF) from the same aircraft, they managed to reach Mersa Matruh three days later.
	Riccardi, Luigi	7 Jun 1941	0820	Taranto	7 Jun 1941	0846	Taranto	2,5	Exercises.
	Riccardi, Luigi	9 Jun 1941	1943	Taranto	12 Jun 1941	0448	Pola	502,4	Passage Taranto-Pola. Uneventful.
	Riccardi, Luigi	13 Jun 1941	1400	Pola	13 Jun 1941	1940	Fiume	57,8	Passage Pola-Fiume.
	Riccardi, Luigi	6 Aug 1941	0715	Fiume	6 Aug 1941	1720	Fiume	67	Sortie for trials and exercises.
	Riccardi, Luigi	10 Aug 1941	0823	Fiume	10 Aug 1941	1735	Pola		Sortie for trials and exercises and passage Fiume-Pola.
	Riccardi, Luigi	13 Aug 1941	0820	Pola	13 Aug 1941	1634	Pola	12	Exercises.
	Riccardi, Luigi	14 Aug 1941	0752	Pola	14 Aug 1941	0922	Pola	7	Exercises.
	Riccardi, Luigi	15 Aug 1941	0800	Pola	15 Aug 1941	1816	Pola	15	Exercises, escorted by the auxiliary Salvore.
	Riccardi, Luigi	16 Aug 1941	0828	Pola	16 Aug 1941	1824	Pola	75	Exercises, escorted by the auxiliary San Giorgio.
	Riccardi, Luigi	19 Aug 1941	2000	Pola	19 Aug 1941	2333	Pola	37	Night gun firing exercises.
	Riccardi, Luigi	21 Aug 1941	0814	Pola	21 Aug 1941	1732	Pola	61	Exercises with the submarines Bausan and Mameli, escorted by the auxiliary Salvore and the torpedo boat Insidioso.
	Riccardi, Luigi	22 Aug 1941	1733	Pola	23 Aug 1941	0120	Pola	54	Sailed with the submarine Pisani for torpedo firing exercises with the torpedo boat Insidioso. Escorted by the auxiliary Salvore.
	Riccardi, Luigi	25 Aug 1941	2229	Pola	28 Aug 1941	1955	Messina	679	Passage Pola-Messina.
		28 Aug 1941	1708 (e)		At 1658 hours, the submarine HMS Unbeaten sighted a BALILLA class submarine proceeding westward (toward Messina) and turned immediately to the attack At 1708 hours, HMS Unbeaten fired four torpedoes from a range of 2,500 yards. They all missed and exploded on the coast beyond. This was Adua on passage from Pola to Messina, but she did not observe the attack.
	Riccardi, Luigi	1 Sep 1941	1904	Messina	3 Sep 1941	0830	Cagliari	345,5	Passage Messina-Cagliari.
	Riccardi, Luigi	6 Sep 1941	0800	Cagliari	6 Sep 1941	1145	Cagliari		Exercises.
7	Riccardi, Luigi	11 Sep 1941	1345	Taranto	18 Sep 1941	1130	Cagliari	848,5	Patrolled off Minorca, on 6° E Meridian (12-13th September), 4° E (14th September) and off Cape Bengut (15-16th September). Uneventful.
		16 Sep 1941	0336	(0) Off Cape Bougaroni.	At 0336 hours, a suspicious vessel was stopped with a warning shot. She turned out to be the French Penerf (2,151 GRT, built 1930), on passage from Tunis to Sète. She was allowed to proceed.
	Riccardi, Luigi	22 Sep 1941	0720	Cagliari	22 Sep 1941	1220	Cagliari		Exercises with the submarines Serpente and Turchese, escorted by the torpedo boat Abba and the minesweeper Balear.
8	Riccardi, Luigi	23 Sep 1941	1910	Cagliari	30 Sep 1941	1030	Sunk (with all hands)		Sailed for patrol between 37°00'N and 37°40'N, and between and 00°40'E and 01°00'E, (northwest of Cape Tenes) off Cape Palos and north of Cartagena (Spain). She was probably sighted by U-371 at 1655 hours on 24th September in German grid CH 6899 (38°27'N, 05°08'E). Sunk at 1030 hours on the 30th in 37°10'N, 00°56'E (northwest of C. Tenes, Algeria) by the destroyers HMS Gurkha and HMS Legion. There were no survivors (five officers and forty-two ratings lost). She should have returned to Cagliari on 3rd October by following the 37°30'N parallel.
		30 Sep 1941	0928 (e)		At 0928B hours, the destroyer HMS Gurkha was screening the HALBERD convoy when an ASDIC contact was made at 2,000 yards. At 0933 hours, she dropped a pattern of fourteen depth charges, set at depths of 100, 140 and 225 feet. After this attack, a round black object was seen coming to the surface. At 0945.5 hours, a loud explosion was heard and felt and at 0947.5 hours, light oil was observed and confirmed by a Swordfish plane. At 0954 hours, HMS Legion dropped a pattern of fourteen depth charges. At 1010 hours, HMS Legion dropped another fourteen depth charges. The area was littered with wreckage and HMS Gurkha lowered a boat and picked up a number of items, including an Italian dictionary, a mattress pillow, numerous pieces of wood including one with a piece of human scalp attached to it by a splinter of metal. There is little doubt that Adua was lost in this attack. There were no survivors. T.V. Luigi Riccardi, four officers and forty-two ratings perished.
		30 Sep 1941	0350	36° 55'N, 0° 45'E (0) Italian Grid 5093/4.	Adua was lost during this patrol, so the details of her attack are not well known. At 0350 hours, she fired a salvo of four torpedoes at a group of eleven destroyers steering 270°, 12 knots. They all missed. These were certainly units of the HALBERD convoy. At 0525 hours, she reported the attack in the last signal received from her.

94 entries. 89 total patrol entries (8 marked as war patrols) and 11 events.

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