Infiltration tactics
In the Spring Offensive of 1918 the first of five parts was called Michael.  At the beginning on 21 March 1918, they took three armies, for a total of 42 divisions. The aim was to break through the salient at the junction point between the French forces (south) and the English (north), with operations between Bapaume and Saint Simon, intending to then create a wedge between the two contingents, pushing the British Expeditionary Force out towards the sea. On the first day the defensive lines were already smashed against both Allies, and the Germans completely succeeded in advancing 65 kilometers long into a salient of approximately 80 km. In their sweeping advance the German troops met greater resistance against the English than the French. But although the Germans were successful at first, after a few days the German offensive was suddenly exhausted, and beginning March 27, when the French began to engage their strategic reserve near Amiens, the Germans had no more substantial territorial gain. So the Germans failed to achieve a strategically important victory, and indeed, it had lengthened the battle line and created a salient exposed to Allied counter-offensives.