A transient was arrested sunday for rape and other charges as Bend Police respond to a call to Marshall High School from a resident complaining that a couple was having sex on the school grounds.  When the police officer arrives on the scene, they found Joshua Leon Hopper, 37, in the act of raping the victim, a 54 year old transient woman. The woman was not moving and was unresponsive, and appeared to be physically helpless. Hopper was taken into custody; Bend Fire rendered air to the woman, who was later transported to St. Charles Bend for her injuries. Hopper is charged with Rape I, Sexual Abuse 1, Assault 4 and Strangulation. The investigation is continuing, and if you have any information about this incident, please call Bend Police.