An army is an organized, land-based military fighting unit. From the ancient world to modern times, the organization and composition of armies has varied considerably.
The earliest armies consisted of warriors in horse-drawn chariots; of infantry--armed foot soldiers; and of cavalry--armed soldiers on horseback. These units were sometimes accompanied by engineers who operated siege weapons and by supply trains to feed and outfit the fighters.
With the introduction of cannon in the 15th century, artillery units were added to the combat sections of armies. In the 19th and 20th centuries, as a result of great advances in technology, other units were added: signal troops, engineer corps for building bridges and entrenchments, medical units, administrative troops, mechanized units to replace cavalry, transportation and communication units, and explosives and munitions experts. The number of such backup or support units has tended to increase as warfare has become more......
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