German submarine U-775
Summary of raiding history
Table:
Date

Name

Nationality

Tonnage[Note 1]

Fate[3]

6 December 1944

HMS Bullen

Royal Navy

1,300

Sunk

28 February 1945

Soreldoc

United States

1,926

Sunk

6 March 1945

Empire Geraint

United Kingdom

6,991

Damaged

Examining the following table labelled section "Summary of raiding history" within German submarine U-775, respond to this question in a short sentence: How effective were the U-775 submarines during the war?  Respond with the correct answer in JSON format as {"answer": "YOUR ANSWER"}.

answer: German submarine U-775 sank one merchant ship, for a total of 1,926 gross register tons (GRT), one warship sunk (1,300 tons) and one merchant ship damaged (6,991 GRT).