Germany was to manage war on two fronts by first invading France, then moving the troops to the Eastern Front to fight Russia. The German Plan does not succeed. The army comes close to Paris, but is pushed back. The attack on France brings Great Britain into the war. The Front is stabilized on a line running from the English Channel to Switzerland.
Russian troops invade Prussia.
Advantage to the Defense Maxim Gun Barbed Wire End of Cavalry and swords Trench Warfare Machine gun gives advantage to the defense. Only masses of men could get passed a machine gun. Artillery bombardments attempt to destroy machine guns and supplies. The war becomes a stalemate It turns into a war of attrition. Germany and Austria-Hungary encircle Russia.