In early 1321, Lancaster mobilised a coalition of the Despensers' enemies across the Marcher territories. Edward and Hugh the Younger became aware of these plans in March and headed west, hoping that negotiations led by the moderate Earl of Pembroke would defuse the crisis. This time, Pembroke made his excuses and declined to intervene, and war broke out in May. The Despensers' lands were quickly seized by a coalition of the Marcher Lords and the local gentry, and Lancaster held a high-level gathering of the barons and clergy in June which condemned the Despensers for having broken the Ordinances. Edward attempted reconciliation, but in July the opposition occupied London and called for the permanent removal of the Despensers. Fearing that he might be deposed if he refused, Edward agreed to exile the Despensers and pardoned the Marcher Lords for their actions.