Hiding cheap units within trees can be quite effective. Lets say your main infantry line is fighting the enemy's infantry force and they are sending their cavalry to flank you, but you have cheapt reserves hiding. They are charging with their cav and think they have an easy win but all of the suddent they are on top of your hidden infantry and their charge is broken allowing to either destroy their cav with your cav or buy time as the enemy cav is forced to either run away and recharge or destroy the unit it is engaging
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