Different Trumpets for Different Troops

To add to the confusion the sound of a trumpet was heard from the theatre. It was a Roman trumpet which the conspirators had procured for the purpose, and being blown by a Greek who did not know how to use it, no one could make out who gave the signal or for whom it was intended.

I’d like to read up one day on the use of musical instruments in warfare and variations among different ancient peoples.  And I just find this bit of Livy (25.10) describing Hannibal’s taking of Tarentum rather amusing.