July 1944: German frogmen destroyed the lock gates on the Orne river.[5] 26 August 1944:MEK 60 German frogmen destroyed the Vascouy coastal artillery battery position.[6] 1944 September 16: By this time the Allies had taken Antwerp. Two teams of five German frogmen left Rotterdam on two attack boats, to attack Antwerp docks. When they were stopped by defence nets, the teams continued by swimming, each towing a torpedo with a ton of explosive.