 John sent troops to help restore Gwenwynwyn to the rule of southern Powys.In 1211, John invaded Gwynedd with the aid of almost all the other Welsh princes, planning according to "Brut y Tywysogion" "to dispossess Llywelyn and destroy him utterly".The first invasion was forced to retreat, but in August that year John invaded again with a larger army, crossed the River Conwy and penetrated Snowdonia.