This poses a distinct problem. Most deployment zones are not wide enough for a real guerilla warrior. At the same time, the opponent must think of a way to contain the manuverability of the opponent. I love it when a well planned attack occurs. . Most unsucessful beginning WE generals forgot this next point and have tooooo scatered an army.
Guerilla warfare is waged by the few but dependent on the many.
That is to say, practically, that the guerilla warrior can not win a battle by himself. He needs to coordinate his guerilla strikes with a more concentrated strike force, a set of units to inflict damage should he be contained and to draw the attention away from the vulnerable harrassing troops. I often use either a block or two of glade guards or 10 glade riders to either move down the middle of the battlefield or hold position. My opponent then faces, breaking his battle lines to go after the flanking treemen, scouts, dryads and warhawks and possibly get charged in the flank from the glade riders or to proceed straightforward. Otherwise, a good opponent will disperse his troops to contain your highly manueverable but individually weak units.