It is an axiom of war that the first troops almost invariably suffer the greatest losses. The first American units to go into the trenches have suffered a low average of casualties. In one respect they are far better off than were the first British and French troops to meet the Germans. They know what they are going up against. Modern warfare is a determined quantity. They know the methods of the men they will fight against and they have allies able to instruct them in the art of fighting as it is practised to-day. We had nothing like that. It was as though we were groping in the dark while an unseen foe was striking at us. For days we tramped through France and Belgium hearing the roar of the German guns, feeling the sting of the shrapnel, but not seeing our foes.