In addition to this, Bruce sent separate messages both to King Felim and a rival dynast, Cathal Ua Conchobair, promising to support them if they withdrew. Cathal managed to return to Connacht and had himself proclaimed king, leaving Felim with no choice but to return to put down his rebellion. Worse followed: De Burgh found himself deprived of not two but three allies and their armies when his kinsman, Walter mac Walter Cattach Burke deserted back to Connacht at the head of several hundred men, probably to guard his own estates from the upcoming conflict. Thus when in August Bruce and his men crossed the Bann (in four ships supplied by Scots sea captain, Thomas Dun), de Burgh retreated still further to Connor, where on either the first or ninth of September a charge by the Scots-Irish led to his defeat. William Liath was captured and taken as hostage to Scotland by Moray who arrived there on 15 September 1315 to raise more troops, ""his ships filled with booty."" De Burgh retreated back to Connacht, while other Anglo-Irish took refuge in Carrickfergus Castle.