 He took the side of John, the king's brother, when the latter expelled the justiciar, William Longchamp, from the kingdom, but he soon discovered that the interests of John were different from those of Richard.Hence in 1193 he joined with the loyalists in making war upon him.In Spring 1194, during the course of the hostilities in England and before King Richard's return, William Marshal's elder brother John Marshal (who was serving as seneschal) was killed while defending Marlborough for the king's brother John.