 Some of his men had been taken prisoner by the garrison of Montgomery and beheaded, and Llywelyn responded by burning Montgomery, Powys, New Radnor, Hay, and Brecon before turning west to capture the castles of Neath and Kidwelly.He completed the campaign by recapturing Cardigan castle.King Henry retaliated by launching an invasion and built a new castle at Painscastle, but was unable to penetrate far into Wales.