These trolls are used primarily in Azog's army, directed to come out as soon as Azog called for his "war beasts". They inflict great damage upon the allied lines of Elves and Dwarves in the valley of Erebor during the Battle of Five Armies. When Orc regiments make their way to the ruins of Dale, some of these trolls join them, climbing over the walls or smashing them down to gain access. One of these trolls is even given a stone headpiece to act as a battering ram against the walls of Dale. Towards the climax of the battle, a band of smaller trolls with clubs rally against Dáin Ironfoot's forces but are stopped by Thorin and Company’s arrival from the gates of Erebor and are soon fought off by the renewed Dwarven advance. Many of the larger trolls are still fighting on when the Bats of Gundabad arrive. But once the Eagles arrive the tide turns, and the remaining trolls either flee into the Were-worm tunnels, or are eventually taken down by the combined allied forces. It is unknown if any survived up to the War of the Ring.Орки Гундабада часто использовали горных , пещерных и каменных троллей. Но из-за того, что при свете дня тролли были бесполезны, ведь они каменели. Когда Мазог только пробивался к власти, он тайно начал скрещивать самых сильных из горных троллей между собой, и получил новый вид-Боевых троллей, которых завербовал в свою свиту и армию. Боевые тролли каменеют на солнце, но могут находится под ним дольше чем обычные тролли.