Simplify the following text for a Grade 5 native English-speaking person.
Original: The Ents attack Isengard , trapping Saruman in the tower of Orthanc . Gandalf , ThÃ oden and the others arrive at Isengard to confront Saruman .
Simplified: Gandalf , his friends , and a small group of Rohirrim then go to Isengard , Saruman 's home .