Soldiers preparing to send msssages back to headquarters by Carrier Pigeon Service, from trenches of the the 167th Infantry Regiment (42nd Infantry,Rainbow Division) in World War 1. A soldier carefully removes a pigeon that had been secured in a wicker basket. Another pigeon is also seen. He attaches a message to the pigeon, as a companion holds it. Next scene shows 167th Infantry troops in their trench. The Pigeon Service soldier releases two pigeons above the top of the trench, and they fly away.