sofar, with my undead army, i am using the metamagic feat fel drain from Libris mortis, i use it on undead torch, this makes it so that whenever my undead strike an opponent, they loose a negative level
another fun use of this spell is to cast a fel drain decomposition (spell compendium again)
if you are playing a game involving army's....
the blizzard spell from frostburn, with its effect radius measured in 100 miles per caster level, dropping 12 inches of snow per round, will stop approaching reinforcements, at least temporarily
sakkratars triple strike from lost empires of faerun is a 5th level spell that lasts for one round that....
with a full attack action you get two extra attacks
keen
flaming burst
all i can think of to help you, i really like animate dead in dnd, its probably my favorite spell
good luck, i have confidence in your victory.