defence in depth. This presented a major obstacle to the Imperial German Army in 1914, whose Schlieffen Plan relied on being able to quickly pass through the Meuse valley and the Ardennes en route to France. The German invasion of Belgium on 5 August 1914 soon reached Liège, which was defended by 30,000 troops under General Gérard Leman in the Battle of Liège. The forts initially held off General Alexander von Kluck's German First Army of about 100,000 men but were pulverised into submission by a five-day bombardment by heavy artillery, including thirty-two 21 cm mortars and two German 42 cm Big Bertha howitzers. Due to faulty planning of the protection of the underground defense tunnels beneath the main citadel, one direct artillery hit caused a huge explosion, which eventually led to the surrender of the Belgian forces. The Belgian resistance was shorter than had been intended, but the twelve days of delay caused by the siege nonetheless contributed to the eventual failure of the German invasion of France. The city was subsequently occupied by the Germans until the end of the war. Liège received the Légion d'Honneur for its resistance in 1914. As part of Chancellor Theobald von Bethmann Hollweg's Septemberprogramm, Berlin planned to annexe Liege under the name Lüttich to the German Empire in any post-war peace agreement. World War II to the present The Germans returned in 1940, this time taking the forts in only three days. Most Jews were saved, with the help of the sympathetic population, as many Jewish children and refugees were hidden in the numerous monasteries. Liege was liberated by the British Second Army in September 1944. After the war ended, the Royal Question came to the fore, since many saw King Leopold III as collaborating with the Germans during the war. In July 1950, André Renard, leader of the Liégeois FGTB launched the General strike against Leopold III of Belgium and "seized control over the city of Liège". The strike ultimately led to Leopold's abdication. Liège began to suffer from a relative decline of its industry, particularly the coal industry, and later the steel industry, producing high levels of unemployment and stoking social tension. During the 1960-1961 Winter General Strike, disgruntled workers went on a rampage and severely damaged the central railway station Guillemins. The unrest was so intense that "army troops had to wade through caltrops, trees, concrete blocks, car and