Infantry are one variety of unit which appears in R.U.S.E. and refers to any non-vehicle ground-based unit, made up of standing soldiers. Infantry are an essential part of any faction's army, as they are the only units capable of capturing enemy buildings without damaging them.
Typically, infantry are slow, but very effective against armored units in close quarters. However, since most armored units have much better range on their weapons, infantry typically overtake enemy armor through ambushes. Infantry are also susceptible to being strafed or bombed by aircraft, particularly fighter-bombers.