In late June, Edward proceeded with his army from Carrickfergus along Magh Line (Six Mile Water), burning Rathmore, near Antrim town, which was a holding of the Savages. He then went south by way of the Moiry Pass – called ""Innermallan"/"Enderwillane"/Imberdiolan"" in contemporary accounts – between Newry and Dundalk. This ancient routeway had been for centuries the passage south out of Ulster into the Kingdom of Mide, Leinster and Munster but because of its narrowness Ulster armies had frequently ambushed and been ambushed at the pass. Here he was met by Mac Duilechain of Clanbrassil and Mac Artain of Iveagh, both of whom had submitted to him at Carrickfergus. Their attempted ambush ended in their defeat and the army pressed on, destroying de Verdon's fortress of Castleroache, and on 29 June attacked Dundalk. The town, another possession of the de Verdon's, was almost totally destroyed with its population, both Anglo-Irish and Gaelic, massacred alike.