'Army' in the Bible

Then I went to the governors of Trans-Euphrates, and I presented to them the letters from the king. The king had sent with me officers of the army and horsemen.

and in the presence of his colleagues and the army of Samaria he said, "What are these feeble Jews doing? Will they be left to themselves? Will they again offer sacrifice? Will they finish this in a day? Can they bring these burnt stones to life again from piles of dust?"