Infantry is the general branch of an army that engages in military combat on foot. As the troops who engage with the enemy in close-ranged combat, infantry units bear the largest brunt of warfare and typically suffer the greatest number of casualties during a military campaign. Historically, as the oldest branch of the combat arms, the infantry are the tip of the spear of a modern army, and continually undergo training that is typically more physically demanding and psychologically stressful than that of any other branch of the combat arms.
Infantry can enter and manoeuvre in terrain that is inaccessible to military vehicles and employ crew-served infantry weapons that provide greater and more sustained firepower. The transport and delivery techniques of modern infantrymen to engage in battle include marching, mechanised transport, aerial drop by parachute or by air assault from helicopter and amphibious landing from the sea.[1]
References / notes
The above term is listed in our Compendium of the Great War.