r>Modern history
In the 18th century, the importance of Dordrecht began to wane, and Rotterdam became the main city in the region. Yet throughout the centuries, Dordrecht held a key position in the defense of Holland. It hosted an army division well into the 20th century. During the mobilization of August 1939, infantry and artillery were sent to Dordrecht to defend the island. When the Germans invaded the Netherlands on the 10th of May 1940 German paratroopers landed in Dordrecht. After fierce fighting they overtook the bridges Dordrecht-Moerdijk and Dordrecht-Zwijndrecht.Many buildings in Dordrecht were destroyed.
At the end of the Second World War, during the winter of 1944–45, Dordrecht and its surroundings were in the middle between the opposing armies. The border between occupied and liberated regions ran along the Hollands Diep. Dordrecht was finally liberated by the Canadian Army
In 1970, the municipality Dubbeldam (then ca. 10,000 inhabitants) and the southern part of the municipality of Sliedrecht were incorporated into Dordrecht, making Dordrecht Island one municipality
