What was the importance of Brass instuments in the roman army

The brass instruments were used to signal in battle and other things. The tubae sounded the charge and the retreat and the changing of the guard. The cornu signaled the motions and the movement of the standards in battle. The tubae and cornu sounded together in action. There was also a buccina only used in the presence of the legate of the legion and for a soldier’s execution.