Army Group North's operations were supported by the other "gruppen". The Polish Corridor and its elimination were the initial priority for the 4th Army, supported by "Luftflotte" 1. The targets were harbours, roads and bridges in the Danzig. III./StG 2 supported the Battle of Westerplatte and Battle of Danzig Bay. second and third group supported attacks on the Polish Navy, after ineffective assaults by the "Kriegsmarine".