The Battle of Liège was the first battle in the World War I. It represents the beginning of the German invasion of Belgium. This battle started on 5 August 1914 and ended on 16 August the same year. The siege of Liège postponed the German invasion of France. Because railways that German army needed were closed, they appeared in the full strength on 20 August.
Brussels was conquered on 20 August. Two days earlier (18-20 August) Belgian forces withdrew from Gete. On 17 August, German 1st, 2nd and 3rd army were able to resume their progress toward the French frontier. The Germans believed that the siege will last only two days. Instead, it lasted 11 days. Belgian resistance (east part of the country) delayed the German progress and gave an opportunity to British and French forces to progress in northern parts of Belgium and France.
Charles Cruttwell, a British historian said that the Belgians were very brave during the resistance which was a surprise to the Germans. However, it didn’t slow them down so much as the destruction of tunnels, bridges and railways did. The resistant led to failures in the German command. They even fire several times on each other during the siege. The German forces had to wait for super-heavy artillery. That delay is responsible for massive casualties. Sewell Tyng wrote that the delay was 48 hours. Other sources claim that the delay was from no delay to 5 days.
According to Herwing, Belgian army lost 20.000 soldiers. Other sources say that Belgium lost between 6.000 and 20.000 soldiers. Also, 4000 were captured. On the other side, German lost 5.300 soldiers.