Question

HELP Latin 2!

Post erat signum, quo oppidum monitum est, milites bellum cum hostibus gesserunt.

The soldiers gave the signal to warn the town and afterwards waged war with the enemies.
I gave a signal which warned the town and the soldiers waged war with the enemies
After there was a sign, by which the town was warned, the soldiers waged war with the enemies.
After the town was warned by means of a given signal, the soldiers waged war with the enemies.