The siege of Namur (French: Siège de Namur) was a battle between Belgian and German forces around the fortified city of Namur during the First World War. Namur was defended by a ring of modern fortresses, known as the Fortified Position of Namur and guarded by the 4th Division of the Belgian Army. The purpose of the fortified Belgian cities was to delay an invasion force until troops from the states guaranteeing Belgian independence came to their aid. The French Fifth Army planned to counter-attack while the Germans were besieging Namur.