A.T. Robertson Commentary Luke 2:13

"And suddenly there was with the angel a multitude of the heavenly host praising God, and saying," — Luke 2:13 (ASV)

Host (στρατιας). A military term for a band of soldiers common in the ancient Greek. Bengel says: "Here the army announces peace."

Praising (αινουντων). Construction according to sense (plural, though στρατιας is singular).