Orc VS Undead

i am very pissed. last night i was playing vrs comp undead with my orcs. I could never make it to them and when i did my units were nailed. i first attacked with FS and 11 raiders with 2 kodo beasts and i think 10 grunts. they were nailed by abomibles(spelling?)and a lvl 5 DL and lvl2 Lich. Well after that i decided to use my lvl3 BL and lvl 7FS with alot of headhunters and grunts. They responded with Gargoyles ghouls and also the lvl5 DL and lvl3 Lich. After that i went to 3 heros and tauren with grunts...i was nailed too. can any1 help me out here?