The German invasion of the Netherlands By Brady1223 Sep 1, 1939 Germany Invades Poland Sep 3, 1939 France and the UK declare WWll Apr 19, 1940 Dutch government proclaimed Martial Law May 10, 1940 German Army invades Netherlands May 13, 1940 The Grebbe Line falls. May 14, 1940 Germany bombed Rotterdam (600-900 Dead) May 15, 1940 General Winemaker signed the Copulation Agreement May 29, 1940 Netherlands surrendered to the Germans, they ruled the land for the next 5 years. Jun 23, 1940 Hitler takes Paris and walks with his entourage near the Effel Tower.