Records show that Walter of Hereford had left Caernarfon and was in Carlisle in October 1300; he remained occupied with the Scottish wars until the autumn of 1304 when building at Caernarfon resumed.
Kilder viser, at Walter af Hereford havde forladt Caernarfon og var i Carlisle i oktober 1300; han var fortsat beskæftiget med krigen med skotterne frem til efteråret 1304, hvorpå arbejdet på Caernarfon fortsatte.