Caernarfon was overrun by Madog's forces and the castle occupied, as were the castles at
Castell y Bere (subsequently burnt),
Hawarden,
Ruthin, and
Denbigh.
Criccieth Castle was besieged by Madog's forces for several months, as was
Harlech. Morlais castle was captured under the aegis of Morgan in the south, and
Cynan ap Maredudd besieged the castle at
Builth for a period of six weeks. Half the town of
Caerphilly was burnt—although the castle itself held out—and, further south,
Kenfig Castle was sacked. In north Wales, attempts were made by many English landowners to retrieve the situation. The lord of Denbigh,
Henry de Lacy led a march to Denbigh after the castle there was besieged; however, he was ambushed outside the town on 11 November, and in the ensuing battle his force was routed by the rebels. In north-east Wales, Reginald de Grey was more successful, stationing substantial garrisons at
Flint and
Rhuddlan—neither castle fell to the rebels, though Flint was subjected to a lengthy siege. Many other castles across Wales were besieged and several towns burnt. In December 1294 King Edward led an army into north Wales to quell the revolt, stopping at
Wrexham,
Denbigh,
Abergele, and elsewhere on his way to
Conwy Castle, which he reached shortly before Christmas. His campaign was timely, for several castles remained in serious danger—
Harlech Castle was defended at one point by just 37 men. Edward himself was ambushed and retreated to
Conwy Castle, losing his baggage train. The town of Conwy was burnt down and Edward besieged until he was relieved by his navy in 1295. ==Battle of Maes Moydog and defeat==