I moved one cavalry unit in and attacked from the south to show that where you attack from doesn't matter, all attacks on a single defender happen at once.  In this case, since it's my turn I am the attacker and the trolls are the defenders. Neutral Units are never attackers until they're emissaried.

I could do more movements and magic attacks if I wanted, but no, lets Select "End Turn" from the Game menu and proceed to physical combat.

Ending your turn really doesn't end your entire turn, just the movement phase. The next phase is Physical Combat.