23 Nov 1940
While attacking convoy OB-244 (4 ships sunk) the boat was seriously damaged in a collision with an unknown object (probably a convoy vessel) and had to return to France for 50 days of repairs. (Sources: Blair, vol 1, page 208)

27 Jun 1941
Having torpedoed 2 ships from convoy SL-78 the boat was depth charged for 11 hours but escaped by going very deep - down to 654 feet, below the range of the British depth charges. (Sources: Blair, vol 1, page 302)

12 Aug 1941
The boat was attacked by convoy escorts near Portugal. 126 depth charges were dropped, including 30 "close by" as reported by the Germans, but caused only moderate damage. The boat returned to France, having been at sea for over 60 days when this attack took place. (Sources: Blair, vol 1, page 336)

21 Oct 1941
After damaging the British Armed Merchant Cruiser HMS Aurania, U-123 took one seaman from this ship on board as a prisoner. In the evening the boat suffered slight damage from two bombs dropped by a British Sunderland flying boat.

16 Jan 1942
At 00.01 hours, the boat was surprised and attacked by an aircraft off New York. Four bombs were dropped that missed and U-123 escaped undamaged by crash-diving. (Sources: KTB U-123)

19 Jan 1942
Kosmos II tried to ram the surfaced U-123 off Oregon Inlet. The U-boat was in shallow water, without any torpedoes left and one of the diesel engines out of order. The Germans managed to get the engine running when the ship was only 75 metres away and slowly out-distanced her at full speed.

27 Mar 1942
After being torpedoed by U-123 off the US East coast the American Q-ship USS Atik (AK 101) took the Germans by surprise with their counter-attack. One man from U-123 was fatally wounded and the Q-ship was sunk with all hands. [Fähnrich zur See Rudi Holzer] (Sources: KTB U-123)

2 Apr 1942
During the attack on Liebre the boat was forced to dive by a patrol vessel and attacked with a depth charge in shallow waters. U-123 only escaped undamaged because no other attacks followed. (Sources: KTB U-123)

11 Apr 1942
After sinking Gulfamerica the boat was located in shallow waters by an aircraft which directed a destroyer to the position. At 09.17 hours six depth charges were dropped on U-123 moving over the bottom at a depth of 20 m and badly damaged her. The boat "played dead", and despite air bubbles escaping from damaged valves no more depth charges were dropped by the destroyer, which left after an hour. Most of the damage could be repaired by the crew and the boat continued the patrol. (Sources: KTB U-123)

25 Aug 1943
Depth charged off Cape Finisterre by allied escort vessels. Date is approximate. (Sources: Blair, vol 2, page 406)

7 Nov 1943
09.44 hrs, Bay of Biscay, inbound: the first recorded attack by a "TseTse" Mosquito aircraft (RAF Sqdn 618, pilot F/O Al Bonnett RCAF) equipped with a 57mm cannon scored a hit on the conning tower which left the boat with one dead, two wounded and unable to dive due to a hole measuring 18 x 6.5cm. [Bootsmaat Günther Struve] (Sources: Ritschel)

11 recorded attacks on this boat.