On the Western Front the two sides were fairly evenly matched. The war became a 'war of attrition'. It was very much a conflict of numbers and of the industrial resources of the two sides. Obviously, this tended to favour the Entente as the war dragged on. Worst of all, perhaps, the machine-gun turned almost every battle into a massacre. The generals on both sides were incompetent and of the lowest calibre that one can imagine. It wasn't till 1918 that the tank was used intelligently.