Verdier on his arrival superseded Lefebvre-Desnouettes, who was considerably his junior, and took charge of the siege. His first act was to develop an attack on the Monte Torrero, the hill in the suburbs, beyond the Huerba, which dominates, at a distance of 1,800 yards, the southern front of the city. The Spaniards had neither encircled it with continuous lines, nor crowned it with any closed work. It was protected only by two small batteries and some trenches covering the most obvious points of attack. The garrison was composed of no more than 500 men, half peasants, half regulars of the Regiment of Estremadura, of which three weak battalions had arrived from Tarrega on the previous day (June 27)[121]. Verdier sent three columns, each of one battalion, against the more accessible parts of the position, and drove out the small defending force with ease. His task was made lighter by a piece of casual luck: on the night before the assault the main powder-magazine of the Saragossans, situated in the Seminary, was ignited by the carelessness of a workman, and blew up, killing many persons and wrecking the Seminary itself and many houses in its vicinity. A few hours after this disaster had taken place, and while the whole city was busy in extinguishing the conflagration, the French attack was delivered; hence the original garrison got no help from within the walls. But its own conduct was deplorably weak: the colonel in command[122] headed the rush to the rear, a piece of cowardice for which he was imprisoned and (after the siege had been raised) was sent before a court-martial and shot. [121] The Regiment of Estremadura was so weak at the outbreak of hostilities that its three battalions had only 770 men. It had been hastily brought up to 900 bayonets before entering the city. [122] His name was Vincente Falco; he belonged to the artillery.