One of the most common battle tactics would be the hammer and anvil. With this tactic, you have a stationary army holding the enemy force in place and then you deploy another army that attacks the enemy from the rear or flanks. I depicted an interesting version of this tactic in The War of the Gilded Beasts. You would have a stationary army holding the enemy in place and then you would have a flying beast (either chimera or dragon) attacking from behind and above. More than 40,000 men die with this tactic and it delivers a crushing victory for one of the armies.