Genivaria wrote:Rome preferably, I don't have Shogun 2. But please feel free to explain that to.
In Rome you need to spread your forces out, form them into self-contained pockets. If you can, hide them, if not, don't worry much about it. Keep ranged units nearby, preferably artillery at a center position. If the enemy tries to pursue you with Cav, use the artillery to decimate them as your infantry pull back. Just pull their troops away from the battle if they only send infantry to pursue.
Never leave more than one unit being chased. Figure out which unit they're going after, and make sure they're wasting a unit for every one of yours that they're chasing. Keep ranged units pursuing them in turn with skirmish mode turned on. Now, the tricky part is the urge to run to the edges of the map or behind your lines. FIGHT THAT URGE. What you need to do is keep them in front of your lines and near your center position. Keep melee infantry behind your artillery to form up in front if they try to rush you. Keep the enemy in front of your artillery and in the killing zone. Keep your center guarded on the flanks with spearmen. Any frontal assault in full force, and you pull up your reserve and hit them with all of your little pockets at once, swarm and surround them.
Now, that's defensive, of course. If you're looking to go aggressive, it's much easier. Form up with three wings, a center position behind two strong flanks. Move up and engage at a distance with their ranged units. Try to outflank them from such a distance that you can lead them away from their lines entirely if they try to pursue. If they reform to stop themselves from being outflanked, rush them in the center. If they recommit their troops to fight off the center assault, hit them from behind/on the sides with both flanks at once.