OFFA’S DYKE, called by the Britons _Clawdd_ OFFA, extended nearly a hundred miles along the mountain border of Wales, from the Clwydian hills to the mouth of the Wye. Part of the Dyke may be traced at Brachy Hill, and Leintwardine, in Herefordshire, continuing northward from Knighton, in Radnorshire, over part of Shropshire, entering Montgomeryshire between Bishop’s Castle and Newtown. It again appears in Shropshire, near Llanymynech, crosses Cern-y-bwch (the Oswestry race-course), descends to the Ceiriog, near Chirk, where it again enters Wales, and terminates in the parish of Mold, beyond which no traces of it are discovered. Offa may have imagined that the Clwydian hills, and the deep valley that lies at their base, would serve as a continuance of the prohibitory line. Pennant tells us, that in all parts the Dyke was constructed on the Welsh side, and that there are numbers of small artificial mounts, the sites of small forts along its course. In the MS. “_Historia Wallica_,” we are informed, that the work of forming this Dyke, forty feet in height, occupied a numerous band of men, “able and accustomed to work in the fields,” more than seven years. This great line of demarcation answered but little purpose as a line of defence, or even of boundary. The Border Lands were still the scenes of sanguinary contests, and superior force alone repelled the Britons. Severe laws were enacted against any that should transgress the limits prescribed by Offa; and one of these enactments declared, that “the Welshman who was found in arms on the Saxon side of the Dyke was to lose his right hand.” These laws, however, were unheeded by the Britons. They deeply felt their injuries, and concerted means of revenge, and, as they hoped, emancipation. They formed an alliance with the kings of Sussex and Northumberland, broke through the boundary, attacked Offa’s camp, slew great numbers, and the Mercian king himself narrowly escaped with a small remnant of his army. On this disaster Offa retired into his own dominions, meditating vengeance. Hostages having been given to him by the Britons, a short time before, during a brief period of peace, he now dealt out to them severe treatment, strictly confining them, and selling, or reserving for perpetual slavery, their wives and children. Still breathing destruction he marched into the confines of Wales with a powerful army, but for years was gallantly repelled by the Britons. At length the contending forces met on Rhuddlan Marsh (now the scene of peaceful arts, the Chester and Holyhead Railway passing over it), and the Britons, under the command of Caradog, were entirely defeated with terrific slaughter, their leader being slain in the conflict. The fury of the Saxon prince did not cease with victory. He savagely massacred the men, women, and children who fell into his hands; and, according to tradition, the remaining Britons, who had escaped the enemy’s sword, fleeing with haste over the marsh,