Treebeard is an "Ent", a tree-like being. He and other Ents live in the forest Fangorn. In the War of the Ring Meriadoc Brandybuck and Peregrin Took come to Fangorn and meet Treebeard. This causes the Ents to go out and fight against the wizard Saruman in his fortress Isengard. The Ents are accompanied by an army of "Huorns" (normal trees that have come alive). After Isengard is conquered, the Huorns go to Helm's Deep, to help the Rohirrim there fight and win against Saruman's army.