I expected something bad to come from the Eastern Dwarves, they were obviously in the position to stab me in the back as soon as I would have been even vaguely vulnerable, but I thought that the Dwarven fortresses in the High Pass were a more imminent threat and I had the Grey Mountains to slow down an attack from that direction anyway.
Although I was never going to launch a direct frontal assault on the High Pass, not yet at least: my plan for this turn was to launch raids, make ambushes and sabotage logistics and forts to generally weaken the Dwarves in the High Pass while avoiding a big pitched battle. Then, according to how effective my Orcs would have been, I would have either tried to take the place directly or tried to come up with some other indirect tactic.
Whether that strategy would have been a huge failure or an outstanding success we'll never know.
But Orcs would have won in the end, 'cuz Green iz Best! Although LotR Orcs are not green, so...