'Army' in the Bible

Next we set out on the route to Bashan, but King Og of Bashan and his whole army came out to meet us in battle at Edrei.

The Lord, however, said to me, "Don't be afraid of him because I have already given him, his whole army, and his land to you. You will do to him exactly what you did to King Sihon of the Amorites who lived in Heshbon."

So the Lord our God did indeed give over to us King Og of Bashan and his whole army and we struck them down until not a single survivor was left.

or what he did to the army of Egypt, including their horses and chariots, when he made the waters of the Red Sea overwhelm them while they were pursuing you and he annihilated them.

When you go out as an army against your enemies, guard yourselves against anything impure.

When a man is newly married, he need not go into the army nor be obligated in any way; he must be free to stay at home for a full year and bring joy to the wife he has married.