The goal of most missions is to either outright defeat
the enemy warband in combat by smacking them all into the ground with extreme prejudice or rout them, which is to say beat the crap out of them to the point where they fail a morale check and scamper for the hills like wimps, which is the way most battles typically end.
Not exact matches
You're also free to build up your
warband by doing regular missions before attempting story missions, so it's possible to enter them with a crew far beyond that of the
enemy.
You may find your leader stuck on his own or the
warband split into several groups scattered far and wide, making regrouping the primary goal before the
enemy can strike.