My army is not optimized for a preemptive strike. The kobolds & skeletons are designed primarily as a siege/blockade force. (i.e. keep them in place while you mop up)
Also, as you've currently planned the attack to occur during the day, you've mostly neutralized my wraiths.
If you want to hit 'em good, turn your initial plan into a feint and hit 'em where they're not looking.
Drak, Tongues, do either of your generals have names?
Fieari, do we control a city between the southern tip of the woods and the north bounds of the desert?