Drogoth was an uruk ofIsengard, who was sent by Saruman to the battle of Fangorn. He betrayed his captain Mauhúr, and he escaped back to Isengard. He fought later in the battle of Hornburg, and he survived. He used the tunnels of the Deep to
Drogoth fighting Éowyn in Helm's Deep
escape to the Mountains, and then, to Isengard. He saw there is water, and he saw Gandalf with Pippin, too. They killed him, and went to Gondor.