Ever since the commencement of the war plots and conspiracies had been rife in that great city--it will be remembered that Duhesme had been forced to punish the most important of them by a series of executions[302]. Discontent was as keen as ever, and a knot of patriots had formed a scheme for opening to their friends without the gates of the fortress of Monjuich, which dominates the whole place. This was to be done by the assistance of a repentant ‘Juramentado,’ a Spanish commissary in the French service named Alcina, who had access to the stronghold, and imagined that he had corrupted the fort-major, a certain Captain Sunier, who for a great sum of money undertook to leave one of its posterns open on the night of March 19th. Campoverde, who loved plots and intrigues, arranged to have his men ready outside the ditch on the appointed night. Unfortunately the officer who was supposed to be a traitor was only feigning discontent and treason, and kept informing Maurice Mathieu, the governor of Barcelona, of all the details of the plot. It was allowed to proceed, in order that a sharp blow might be inflicted on the Spaniards. Before the appointed night Campoverde suddenly marched the divisions of Sarsfield and Courten to the immediate vicinity of Barcelona, and sent forward from them a body of 800 grenadiers, who were to execute the actual _coup de main_. They were allowed to descend into the ditch of Monjuich, and to approach the postern, when the whole of the ramparts were lighted up with cressets and fire-balls, and a furious fire was opened upon them. The head of the column was blown to pieces, a hundred men were killed and wounded at the first volley, and four officers and many of the rank and file taken prisoners, before the remainder could scramble off in the darkness. The supports hurriedly retired, and the business was over--save that Maurice Mathieu caused the commissary Alcina to be shot in public next morning as a warning to traitors. Such plots seldom succeed, but that they must not be too much disregarded as a source of danger was shown only a few weeks later, when Figueras, the second fortress of Catalonia, was successfully surprised by the Spaniards, as the result of a conspiracy exactly similar to that which failed at Barcelona[303]. [302] See vol. iii. p. 24. [303] See below, sect. xxviii. chap. i.