With these grievances, two years of combat followed (1186–1188), but the situation remained unchanged. Philip initially allied with Henry's young sons Richard the Lionheart and John Lackland, who were in rebellion against their father. Philip II launched an attack on Berry in the summer of 1187, but by June made a truce with Henry, which left Issoudun in Philip's hands and also granted him Fréteval in Vendômois. Though the truce was for two years, Philip found grounds for resuming hostilities in the summer of 1188. He skillfully exploited the estrangement between Henry and Richard, and Richard did homage to him voluntarily at Bonsmoulins in November 1188.