The Raid on Constanța was an attack by the Soviet Black Sea Fleet on the Romanian port of Constanța on 26 June 1941, shortly after the beginning of Operation Barbarossa, the Axis invasion of the Soviet Union, and resulted in the only encounter between major warships in the Black Sea during World War II. The attack was intended to be a coordinated effort between the fleet's ships and aircraft to split the attention of the defenders, but the bombers did not attack at the designated times.