Before the start of , Gazmog was a snaga chief of Fangorn. Later, one of the nazgul came to Gazmog, and commanded to go to Isengard. When Gazmog, with Frûshkul and Gurbash, entered the tower of Orthank, they went upstairs to Saruman's chamber and he gived them first orders. Gazmog was a lumberjack in the Garden of Isengard. When there were no trees, Gazmog became a snaga-war-chief of the White Hand and he led snaga armies during the battle of Hornburg. He was killed by Gandalf the White, when he tried to slain the wizard.