A) set up traps
Hazjul knew the passes had to be riddled with traps, it would be impossible to fight a full forced attack. A slightly wounded enemy might be strong still in force, but the traps would wound their morale; it would put fear into the minds of Orcs that thought they were safe. Pits with wooden stakes, trip wires that would cause small rock slides, and if particularly unlucky knock loose a boulder. Yet the single most important part were the small groups of "Boulder Ghosts", Orcs that would lie in wait at the top of hills or over paths that ran through tall valley like walls. Any group unlucky enough to be caught off guard would find themselves in the path, or in the shadow, of a large boulder. A particularly deviant idea brought up by one of the more clever orcs, Korg "Trappa".