 By the end of the war, the best German troops were dead and the remainder were under continuous pressure on all parts of the Western Front, a consequence in part of an almost endless supply of fresh American reinforcements (which the Germans were unable to match) and in part of industry at last supplying the weakened Entente armies with the firepower to replace the men they lacked (whilst Germany wanted for all sorts of materials thanks to the naval blockade).Interior lines thus became meaningless as Germany had nothing more to offer its allies.The props eventually fell, but only because they were themselves no longer supported.