A few miles south of Inverness, his party was ambushed by a force led by Andrew Moray and Alexander Pilche.

With the loss of a number of men and horses, FitWarin was fortunate to escape with his life to the safety of Urquhart Castle.

Following the siege, FitzWarin wrote to King Edward in July 1297: "Some evil disposed people have joined Andrew Moray at the castle of Avoch in Ross."

Present at the Battle of Stirling Bridge on 11 September 1297, he survived the defeat of the English army at the hands of the Scots under William Wallace.

She had previously been the wife of Magnús Óláfsson, King of Mann and the Isles (d. 1265), Maol Íosa II, Earl of Strathearn (d. 1271), and Hugh, Lord of Abernethy (d. 1291/2).