An army is a large, organized group of soldiers trained to fight other armies or groups. An army's main job is usually to defend its country in times of war. An army protects the country against attacks or invasion by enemies. It may also fight in other parts of the world.

Armies Today

Modern armies have ranks, or levels of power. The soldiers who command soldiers in lower ranks are called officers. The officers in the highest ranks are the generals. The generals are in charge of the army as a whole. Beneath the generals are the commissioned officers. They are graduates of special military training schools. Beneath them are the noncommissioned officers. These are men and women who started out as ordinary soldiers and moved up through the ranks. The ordinary soldiers, or privates, make up the lowest ranks of an army. In war, the privates do most of the actual fighting.

Sometimes people are drafted, or ordered by their government to join the army. Drafts are common in times of war when too few people volunteer. For example, the United States, Canada, and the United Kingdom had drafts during World War II. Today, however, volunteers make up these countries' armies. Some countries, like China and Israel, still require most of their citizens to serve time in the army.

History

The first army was probably organized in Sumer, a civilization that began more than 6,000 years ago in the Middle East. The earliest battlefields were filled with warriors in chariots, men on horseback, and soldiers on foot. They fought with swords, shields, and bows and arrows. They protected themselves with various kinds of armor.

Over the centuries, new developments in warfare changed the way armies fought. Arabs and Europeans invented weapons that used gunpowder in the 1300s. Armies began using machine guns in the 1800s and bombs in the 1900s. Armies continue to develop new weapons. New technology also has helped improve communications and protect soldiers on the battlefield.