The player start with three Cavaliers, three Hand Cannoneers, and three Condottieri. The goal is to run outside of Brescia with one of the troops without being killed by the Venetian army. After the player is out of the city, they will be in control of a mercenary camp at the southern edge of the map.
The first part of the scenario is to escape Brescia. The Hand Cannoneers can be left aside, they're too slow and will die easily. Speed is the key; just take the Cavaliers and Condottieri.
Once in control of the camp, concentrate on one enemy composition, like Cavaliers and Hand Cannoneers to deal with the Florentines. The destruction of the enemy camps is not necessary, but it's useful to be safe in the last fight against Brescia.
Brescia is not really well defended, they don't have a great variety of units, and once the player breaks the towers the city should be cleansed quickly.