My army setup at the beginning of the battle was rather ordinary as it usually is when fighting the SPQR stack and consisted of a double line of infantry with cav on either side and the general in the middle for morale and a backup charge. This often happens against the SPQR because there are plenty of pila that really hurt when they hit you and can rout an early unit quite easily if it gets hit twice, this happened to one of my Warbands. Poor unit lost half its men.
I moved my cavalry in and began harassing the enemy Velites, using one unit of cav to drive the skirmishing units out towards the open where another unit would attack them, causing them to rout. I managed to destroy one unit and set another one fleeing before the battle proper commenced.
I managed to isolate a unit of Hastati by luring them to throw their pila at a general's cav unit before running out of the way and then charging at the cav, who quickly ran behind the waiting Warbands who'd just finished their warcry. The general then swung back behind the unit and routed it. You can also see where I was directing the units to march to. I made sure that most of my Warbands were on the wings. When they attacked, I tried to have one unit charge the front and another run up alongside the charging unit. When the charger hit, the second group would advance a little further before charging into the flank from the outside. A unit of cavalry would strike back to rout them in a classic hammer and anvil style.
Here you can see the wings have begun to give in and my Warbands and rolling in, with cav units beginning to move behind the army battle line in preparation for the rout in which I want to catch the enemy general if he doesn't fall while fighting.
And here, the rout. Cavalry units are prepared behind the old enemy lines to catch the general as he makes for his retreat point.