Though the hobbits were overjoyed to see Gandalf alive, they were less pleased to be left uninformed. Since Treebeard and Gandalf lacked the time to tell them what was happening either in Isengard or Helm’s Deep, they were forced to stay out of the way and speculate, concerned for their friends. In battle, the hobbits couldn’t be of much direct help. Their role was to incite the battle and then to provide comfort for their friends afterwards. The ents use the natural world to their advantage when taking over Isengard. As the huorns kill orcs at Helm’s Deep, the river Isen itself clears away the pollution around the tower.