Armies are the plural noun of arms. Derived from the latin word Brachium meaning the upper segment of the arm or forelimb extending from the shoulder to the elbow.
Armies holds some of the larger upper body muscles and are
particularly expanded in men as they have a high amount of
testosterone which helps build muscle strength in order to flex on the ladies and get some sweet puss. This serves the purpose of
procreation and protecting ones children during aggravated disputes against other males.