Overview: When Przemysl falls for the 2nd time and when the British and ANZAC troops fail at Gallipoli again, one thing becomes clear: Artillery is the key for future battles. August von Mackensen had used it with great success at the Gorlice-Tarnow-Offensive and the French even diverted one million men to shell factories. Meanwhile German Zeppelins bombed London and the US sent submarines for aid.