German submarine U-751
Summary of raiding history

Date
Ship Name
Nationality
Tonnage
Fate
14 June 1941
St. Lindsay
United Kingdom
5,370
Sunk
21 December 1941
HMS Audacity
Royal Navy
11,000
Sunk
2 February 1942
Corilla
Netherlands
8,096
Damaged
4 February 1942
Silveray
United Kingdom
4,535
Sunk
7 February 1942
Empire Sun
United Kingdom
6,952
Sunk
16 May 1942
Nicarao
United States
1,445
Sunk
19 May 1942
Isabela
United States
3,110
Sunk

Question: What sank the ships Nicarao and Isabela?
Answer: U-751 sank the American ships Nicarao and Isabela on 16 and 19 May 1942, totalling 1,455 and 3,110 GRTs respectively.