The siege of Antwerp was an engagement between the German and the Belgian, British and French armies around the fortified city of Antwerp during the First World War. German troops besieged a garrison of Belgian fortress troops, the Belgian field army and the British Royal Naval Division in the Antwerp area, after the German invasion of Belgium in August 1914. The city, which was ringed by forts known as the National Redoubt, was besieged to the south and east by German forces.