The trolls operating the siege weapons were assailed, but there were simply too many giant bats.
The giant bats enveloped the trolls, and by the time they separated, the trolls had been reduced to scattered skeletons.
"Break the equipment." The Blood Hunter swung his longsword, shattering the contraption.
They needed to eliminate all the siege weapons before the other trolls could provide support.
Soon, the outraged roars of the trolls echoed around them, but by then, the Blood Hunter and his skeleton giant bats had already completed their task and began to retreat.
The Blood Hunter returned to camp, remounted a dragon, and with the rest of the dragons, took back to the sky.
They dove back into the depths of the Bloodthroat troll army from behind, spewing forth their deadly breath.
Columns of dark energy swept through the troll ranks, swathes of trolls started dying, leaving behind fields of bone.