From the time they entered the land of Canaan until the time of the kings, the Israelites made little progress in military affairs, although they were often engaged in warfare. The kings introduced the custom of maintaining a bodyguard (the Gibborim; i.e., “heroes”), and thus the nucleus of a standing army was formed. Saul had an army of 3,000 select warriors (1 Samuel 13:2; 14:52; 24:2). David also had a band of soldiers around him (1 Samuel 23:13; 25:13). To this band, he later added the Cherethites and the Pelethites (2 Samuel 15:18; 20:7).
At first, the army consisted only of infantry (1 Samuel 4:10; 15:4), since the use of horses was prohibited (Deuteronomy 17:16); but chariots and horses were later added (2 Samuel 8:4; 1 Kings 10:26, 28-29; 1 Kings 9:19).