On the 21st of June, the MacWilliam Burkes and their allies provoked a set-piece battle against the besieging forces. Fitton was dug in around the castle, and the MacWillams lined up their infantry and dismounted cavalry uphill from the defences. Fitton refused to budge from behind the siegeworks, so the enemy decided to attack. They pushed through the cannon and musket fire, hitting the besiegers with momentum. The besiegers broke and started to run for their camp a few miles away. The MacWilliam infantry followed closely to push their advantage, but this allowed Fitton and his cavalry to get behind them and attack the usually exposed rear. However, the MacWilliams held their shape in the face of this onslaught, until their own cavalry could pour in. A very tough fight broke out.