Whenever they became a target of opportunity.
'42 thru '44.
When ever they were presented with targets of opportunity.
Guerre de Course, merchant warfare.
Because the German navy was not a strong navy, they had to rely on submarines to attack merchant ships...Guerre de Course (Commerce Raiding).
We entered World War 1 because of a German submarine attack on U.S. merchant ships in 1917.
War material.
'42-'44
America's support of the allies led Hitler to attack American ships.
America's support of the allies led Hitler to attack American ships.
America's support of the allies led Hitler to attack American ships.
Warships traveled with Merchant ships for protection.
Warships traveled with merchant ships for protection