'Army' in the Bible

Then I came to the rulers of the lands across the river and gave them the king's letters. Now the king had sent with me captains of the army and horsemen.

And in the hearing of his countrymen and the army of Samaria he said, What are these feeble Jews doing? will they make themselves strong? will they make offerings? will they get the work done in a day? will they make the stones which have been burned come again out of the dust?