On the early morning of 1 September 1939,
Schleswig-Holstein fired a
broadside at the Polish garrison. That salvo's time has been variously stated as 04:43 04:45, or 04:48. Polish historian Jarosław Tuliszka explains that 04:45 was the planned time, 04:47 was the time the order was given by Kleikamp and 04:48 was the time the guns actually fired. Other sources indicate the shot was fired at 04:00 rather than at or around 04:45. Eight minutes later Henningsen's marines from the
Schleswig-Holstein, who had disembarked two hours earlier on the eastern side of the peninsula, advanced, expecting an easy victory over the Poles. Meanwhile, the German infantry was also shelled by the Polish mortars, and even the battleship itself was targeted by the Polish 37 mm guns. At 06:22, the German marines frantically radioed the battleship that they had sustained heavy losses and were withdrawing. Casualties were approximately fifty Germans and eight Poles, mostly wounded. A longer bombardment from the battleship, lasting from 07:40 to 08:55, preceded a second attack and succeeded at knocking out the Polish field gun. The German commanders concluded that a ground attack was not feasible until the Polish defences had been softened up. In the following days, the Germans bombarded the Westerplatte peninsula with
naval and heavy
field artillery, including a 105 mm
howitzer battery and 210 mm howitzers. The Poles'
Wał outpost had been abandoned. Now only the
Fort outpost prevented an attack from the north. Though the Poles never landed a hit on the German naval units,
T196 and
Schleswig-Holstein suffered accidents due to crew error or equipment failure, with at least one fatality and several injured men on the battleship. , 8 September, after the battle At a second conference with his officers, on 6 September, Sucharski was again ready to surrender: the German Army was by now outside
Warsaw, and Westerplatte was running critically low on supplies; moreover, many of the wounded were suffering from
gangrene. Sucharski surrendered the post to Kleikamp, and the Germans stood at attention as the Polish garrison marched out at 11:30. ==Aftermath==