Ok, this is probably one of the most difficult Warcraft 2 scenarios out there. But I did not make it impossible, just very challenging.
-Hints-
Build up lots of archers and guard towers ASAP, the orcs will attack en masse by air first.
You have one ally but they are very minor and it's not worth the trouble to find them at first.
Try to attack the orcs base directly to the south first, they are the weakest.
Please let me know what you think of this map. If you think it's not difficult enough I'll upload my first map, which I thought may be too difficult, but we'll see.