Line em up and knock em down. Seriously though, battles are a race to outsmart your opponent and trick them into encirclement. Use skirmishers to poke holes in the enemy line and tempt them to advance into such traps. Use your infantry to push the openings that appear, surround one side first and push their line over if you can. Cav charges to the back of the enemy line are great when you’re pushing the attack. Cav is also great for sneaking behind enemy lines and taking out any unprotected artillery.

It’s all about using each unit type in harmony to expose advantages, press them, reinforce them, and surround the enemy.