I have reached the stage where I am attacking Mordor, I have split my army roughly in two. One to defend the black gate the other to siege Henneth Anduin. I left 1500 troops at the Black Gate thinking it would easily be enough. An armry of 4000 mordor troops turns up mostly consisting of orc raiders and some Uruks and a Olog Hai. I thought I would easily be able to win as I had alot of high quality archers and stuff like one heavy spearmen and two heavy swordsmen. I got slaughtered because for some reason the archers cant find over the wall very well and the enemy just pushes through and wont ever rout. I am not really sure what to do (I have a save before the battle). I dont understand why 1500 men cant easily beat a 4000 man army which is coming through a tiny gate? Would letting them in slightly with a circle of troops formed round the gate with archers behind so they have a better LOS work?