CREATE TABLE table_61593 ("Date" TEXT, "Time" TEXT, "Name of ship" TEXT, "Flag" TEXT, "Tonnage" FLOAT, "Fate" TEXT)

What is the Name of the Ship attacked on 20February1942?
SELECT "Name of ship" FROM table_61593 WHERE "Date" = '20february1942'
SELECT "Name of ship" FROM "table_61593" WHERE "Date" = '20february1942'