When defending I like to hide one wing in woods, prefered first class units that are equipped with javellins as well (works very well with Sweboz, Romani and the like). When the enemy tries to outflank what he belives is my right wing, but what is actually the center of my line, he runs into the ambush of the real right wing. They get a moral penality for 'emerging enemy', are already exhausted, now showered with javellins and charged from close distance. That will usualy break his assault wing on the spot.

Haveing a few horsemen hidden even further right (or left, if the woods are on that side) ready to cut down the routed units, can take out 1/3 of the enemy army within minutes.