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164 their assistance for the overthrow of the Guelphs of Lucca, and for placing him in authority over his native town; while the tyrant of Pisa should in return gain a faithful ally, and one more step should be taken towards the final establishment of the Ghibeline ascendancy.

After arranging this scheme, Castruccio and his companions passed the defile of the Serchio; and, advancing towards Lucca, assumed a warlike appearance, and endeavoured to force the gate of San Frediano; the Guelphs opposed him, and battle ensued. In the mean time Uguccione arrived in another direction, and, not finding free entrance at any of the gates, began to batter the wall. The Guelphs, defeated by the Ghibelines, were in no condition to resist; the Ghibelines, headed by Castruccio, considered Uguccione as their ally, and thought not of impeding his operations; indeed they were fully employed in resisting their adversaries, who, though worsted, would not yield. The breach was effected, Uguccione entered triumphantly, and, treating Lucca as a conquered town, delivered it over to be sacked