Catapults

Dain sent forth his goat cavalry and spinning ballistas upon the Elven forces, who tried to counter with a shield wall and archer formations; during this early conflict, most of the dwarven cavalry was killed or the dwarves dismounted from their goats and elves were killed until the Were Worms burst forth from the earth and the fighting stopped instantly in the face of the new enemy.
Seeing the danger, Dáin ordered his forward units to rush out onto the plain and set up a phalanx formation to counter the Guldur Orc charge while Thranduil and the elves remained motionless. Just before the Orcs collided the Dwarvish forces, Thranduil sent in hundreds of elves jumping over the Dwarven lines to strike deep into the enemy lines, blunting the Orc charge and giving the Dwarves a chance to mount a counter-charge that skewered hundreds of Orcs, followed soon after by the rest of the Elvish and Dwarvish forces. Determined to regain the initiative, Azog sent in his "War Beasts", a cohort of huge armored trolls who smashed into the left flank of the allied armies and began wreaking havoc. Thranduil's Elven archers countered some of the trolls by letting lose several volleys of thousands of arrows which took out several of the beasts and hundreds of orcs, which in turn allowed Dáin's war-chariots the opportunity to charge into the orc lines and cut many of the orcs down. Azog furiously countered the "war machines" with his ogre shock-troops who charged against the chariots, brought them down and slaughtered the drivers and goats.