Battle of Danzig Bay
The Battle of Danzig Bay (Polish: bitwa w Zatoce Gdańskiej) took place on 1 September 1939, at the beginning of the invasion of Poland, when Polish Navy warships were attacked by German Luftwaffe aircraft in Gdańsk Bay (then Danzig Bay). It was the first naval-air battle of World War II. == Background == The Polish Navy of the Second Polish Republic (1919–39) was prepared mostly as means of supporting naval communications with France in case of a war with the Soviet Union.