After the British and French had declared war on the German Reich on the 3rd September 1939, the Western Front became a ghost front. It was only the start of the Western Campaign on 10th May 1940, that started the battles. The fast advance on Moscow in 1941, forced the German soldiers to bring tremendous march achievements. On dirt roads, often through boggy ground, the German troops pushed eastwards. The Wehrmacht soldiers had to cope with an enormous workload. According to the Versailles Treaty, Germany was only allowed to have an army of 100 000 men. This army, from 1919 until 1921, was referred to as the "Provisional Reichswehr".