23 May 1940
For the second day in a row, the outbound boat encountered an enemy submarine in the North Sea. This time a torpedo track was seen passing the bow in a distance of about 50 metres.

29 May 1940
At 16.30 hours, the boat was attacked by an aircraft with 2 bombs west of the English Channel and suffered minor damages. (Sources: Ritschel)

31 May 1940
After a successful attack on convoy HGF-31, the boat was attacked for 4 hours with 34 depth charges. When they went on periscope depth, an armed trawler dropped 7 depth charges at 22.00 hours, causing several damages. (Sources: Ritschel)

4 Jun 1940
At 20.14 hours, the boat was attacked by an aircraft with a bomb west of the English Channel. No damages. (Sources: Ritschel)

23 Jun 1940
At 04.08 hours, the inbound boat was attacked by an aircraft with 3 bombs in the North Sea. The persicope was damaged. (Sources: Ritschel)

3 Sep 1940
While searching for a convoy west of Ireland, the boat was attacked by an escort with depth charges in 5 attacks, causing several damages and a flooding that could be stopped by the crew. (Sources: Ritschel)

19 Oct 1940
During its last attack on the convoy SC-7, the boat was shelled by a freighter, but this did not prevent U-101 from firing the last torpedoes. The shells hit the water behind the boat, which was turning away zig-zagging without being hit. (Sources: Ritschel)

29 Jan 1941
When the boat tried to attack the convoy SC-19, a destroyer forced it to dive by gunfire at 04.16 hours and then dropped 3 depth charges. No damages. (Sources: Ritschel)

23 Apr 1941
The boat encountered a British submarine in the North Atlantic, which fired two torpedoes, but both missed.

24 Aug 1941
At 09.53 hours, the boat was attacked by an aircraft with 2 bombs near Rockall. No damages, but U-101 had to crash-dive another five times to evade aircraft operating in the area on this and the next day. (Sources: Ritschel)

28 Aug 1941
While operating against convoy OS-4, the boat was forced to dive by a destroyer at 03.03 hours and attacked for 3 hours by several escorts with 30 depth charges. The attacks were carried out accurately, but the damages were not serious except the disabled periscope. (Sources: Ritschel)

13 Oct 1941
At 10.45 hours, the outbound boat was attacked by a twin-engined aircraft with 3 bombs in the Bay of Biscay. The attack apparently caused a small trace of oil, because the submerged boat was attacked again with 3 bombs at 16.42 hours. (Sources: Ritschel)

12 recorded attacks on this boat.