Kept cheap upkeep and fixed ALL Pikemen(replace the older file with this one)
Remember how in Rome: Total War how Pikemen did a real good job at killing? hate how your Pikemen keep dropping their Pikes to fight with Swords? no longer! with a visit to the Reich's infirmaries, your men have had their brain damage fixed.
What this means: your Pikemen and Halberdiers will HOLD THE LINE, as long as you can protect their flanks, melee infantry cannot harm them from the front(tip, if you're fighting them, get a unit of peasants or chaff units to hit them form the front, flank their sides or rear and watch them crumble!)