infantry

The branch of an army made up of units trained to fight on foot.

Soldiers armed and trained to fight on foot.

A unit, such as a regiment, of such soldiers.

Soldiery ✓ serving on foot, as distinguished from cavalry; that part of a military establishment using small-arms, and equipped for marching and fighting on foot, constituting the oldest of the “arms” into which armies are conventionally divided.

[As if directly ⟨ infant, n., 1, + -ry.] Infants in general; an assemblage of children.