The document discusses reasons for the stalemate on the Western Front in World War 1. It describes the original Schlieffen Plan to quickly defeat France by enveloping its forces, but changes made by Von Moltke reduced forces on the decisive right wing. This caused supply issues for Germany and altered the force ratio against France. As a result, the Germans halted near Paris instead of capturing it, allowing the French to counterattack at the Marne. The battle resulted in a German retreat to the Aisne River, where trench warfare became entrenched for the duration of the war, causing the stalemate.