USS Greer incident
The USS Greer incident was a very bewildering confrontation. On September 4, 1941 the USS Greer, and the U-652 German Submarine had a misapprehension of each others action. ... The USS Greer was on route to Iceland with mail, freight and United States passengers. Early that morning of September 4, 1941 a British plane located the presence of a submerged submarine about ten miles directly ahead of the USS Greer.