Brown = elevated areas/hills
Yellow = flat lands
green triangles = forests
Deployment:
-The longbowmen (B) and Wolf Cavalry & Manchurian conscript/volunteer (WC) will be in hiding. The cavalry will be hiding deep in the forest, where as the longbowmen will lie flat on the ground to avoid being seen.
-The archers (b) will be in hiding in the forests as well, but they will not be that deep in the forest.
-The Spearmen/conscripts (S) will line up a bit infront of the entrance of the pass and beside the forests, to avoid the flank getting attacked by the mongols (horses don't go in forest well). They will carry large pieces of wood/shield to cover themselves from mongol archery, thus forcing them to result in close combat.
Military Operation:
-The mongols will come riding hard on the spearmen. When they go between the forests, the archers will expose themselves and fire at the mongols from the side. Naturally, this will not be enough, but it'll trick the mongols into thinking that's the only ambush we have. It goes in accordance with their intelligence of my military before i drafted the new troops. When the mongols meet the spearmen, have them fight as best as they could, but eventually they will lose ground (wouldn't have to do so on purpose, sadly) and retreat into the pass. By this point the archers will also retreat in the direction of the pass.
-When some of the mongols have entered the past, the longbowmen will stand up and reveal themselves. They will start by having some non-longbowmen/conscripts raising/waving silks/bronze mirrors/anything that reflects the sunlight. This will blind the mongols temporarily, at which point a pre-set trap of rocks will be activated to cut the mongols in two. The longbowmen will fire at the mongols in the pass as well at this point (the retreating spearmen/archers will also fight back). The WC will now ride out and attack the rear flanks of the mongols left outside the pass, with support from above with the longbowmen. Their strategy will be firing arrows from far first (using the specially made bows with a longer range than the mongol ones) to cause even more confusion amongst them, then charging in to deal the lethal blow.
P.S. have the emperor with the spearmen to make mongols believe this is my full army