The subject of this article originates from non-canonical sources. To find out about what is considered "canon" see LOTR:Canon.
After the resurrection of Skorgrim, the Dourhands (along with their new found allies the Goblin Blue-crag Goblins began to wage war against the Longbeards in small raids all across the Blue Mountains (Ered Luin). The first truly organized attack Skorgrim launched however was by no means small. Gondamon was located directly in the middle of Blue Mountains and was a key position for anyone seeking to control the region. Skorgrim knew that the Longbeards relationship with the Elves of southern Blue Mountains was diminishing so he exploited it. If the Dourhands took the city then they could keep the Longbeards and the Elves from making any sort of alliance and would cause both Durin's Folk and the Elves to be weak against the combined might of Skorgrim's new hoard. In the dead of night after months of planning the Dourhands and Blue-crags launched a surprise assault on the walls. Many on both side were slain in the foray and for an hour the battle seemed won in favor of the Dourhands. The Longbeards had been pushed back into the center courtyard after losing the walls and Skorgrim's forces had surrounded them. A
desperate fight ensued and one by one the defenders fell until only twenty remained, these twenty rallied to Mathi Stouthand, the lord of Gondamon who stood near the keep. When all seemed lost until adventurers with a small host of men cut through the enemy lines and drove off the host from the walls. The reinforcements quickly took to the battlements alongside the survivors and against all odds held for nearly two weeks. At dawn on the final day of the assault all that was left of Skorgrim's host was unleashed. wave after wave of Goblin, Troll, Dwarf, and near the end even a Fire-drake. By the end of morning the siege was over and the Dourhand forces were decimated. The walls of Gondamon stood strong thanks to the cities brave defenders.