The dwarf army quickly captures its ancient capitol as few orcs were there defending it, as spies had predicted.
A larger dwarf force attacked the main orc stronghold in the mountains, resulting in a total rout of the orcs, who were caught unawares and drunk (it seems that the orcs were celebrating a full moon and the summer solstice being on the same day). The dwarves have sustained moderate losses, though the body count shows that upwards of five times as many orcs were killed in battle, and ten times as many are suspected of being wounded, with as many captured (and executed or given as slaves to the humans, don't know if the Tsardom will spring for that, but the door's open). Spies report that thousands of orcs are already fleeing through the plains west of the mountains and those that remain are rallying at the orc capitol in these mountains.
Not many humans have died so far, the majority of friendly casualties have been among the vanguard dwarves.