Periods 1-16

action advance Allies American arms Army artillery attack authorized base battalion battle became began brigade British called camp campaign carried cavalry Chief Civil close Colonel combat command companies complete Congress continued corps defense Department developed direct divisions duty effect enemy equipment established experience field fighting final fire forces formed four French front German ground guns heavy important increased Indians infantry Italy land later less light major miles military mobilization months move Navy necessary needed never North offensive officers operations organization period position possible prepared President problem reached regiments Regular replacement result rifle river road schools sent side soldiers South Staff strength success supply tactics tion troops turned United Washington weapons West whole World