I usually use similar tactics as econ21 and Dead Guy.

Have my archers hide behind a bunch of spears and let the enemy come has been my usual playstyle in previous titles. Now, the enemy finally knows they can fire back, so I sometimes put my archers in front of my spears. Imo, retreating your archers when the enemy infantry charges is less effective than letting your own infantry charge at the charging enemy and have them clash in front of your archers. Currently playing as the Date, I'm slowly starting to occasionally have my No Dachi or Katana samurai charge first and it does have good results. Cavalry isn't as powerful as in previous titles, but still very effective to cause a chain rout when charging a few enemy infantry units in the rear.

Just like Dead Guy, when on the offense, I always try to take down a few units on the enemies' flanks with my archers or try to bait them with my cavalry before really engaging them.