On the 16th, 17th, and 18th Suchet was employed in bringing up his siege-guns, choosing the emplacements of his camps, and constructing flying-bridges across the river, both above and below the fortress. On the 19th active operations started, with the development of a false attack on Fort Orleans, whose attention it was necessary to distract. The construction of a first parallel against this work was begun with some ostentation, and had to be carried out under a furious fire from its artillery. On the night of the 20th-21st the real business commenced: 2,300 men crept across the flat ground by the river opposite San Pedro, and threw up an entrenchment within 160 yards of its ditch. They were undiscovered and unopposed, for the night was dark and windy, and the Spaniards had no outposts beyond the walls, and kept bad watch. At dawn 500 paces of trench had been constructed, and a safe access to the parallel had been contrived, by connecting one of its ends with a ravine which cuts across the flat a little to the rear, and whose bottom could not be searched by the guns of the place. The trench was sloped away on the right, so as not to be enfiladed by downward fire from Fort Orleans, which would have commanded it supposing it had been drawn exactly parallel to the front of San Pedro. This was a tremendously advantageous start; seldom has a besieger been able to begin his works at such a short distance from his objective. Next morning the new trench became visible to the Spaniards, who turned all the artillery of the neighbouring front upon it, but to little effect, for the soil was soft and the French had dug deep. A sortie was made from the demi-lune of El Temple, but was driven off with loss. The only successful effort of the Spaniards on this day was that the guns of Fort Orleans succeeded in destroying part of the trenches of the false attack in front of them, and drove out the workers. This was of little consequence, as Suchet was not really aiming at the fort. On the 22nd and 23rd December the main attack was urged with a celerity that seemed appalling to the defenders; despite of a heavy fire of musketry as well as of artillery, approaches were pushed forward from the first parallel, to within 80 yards of the bastion of San Pedro and 110 yards of the Temple demi-lune. The works opposite Fort Orleans were repaired and extended. On the 24th the two approaches in the plain were connected by a long trench, which formed the second parallel, only 60 yards from the walls. On the 25th new zigzags, thrown out from this line, reached the glacis of San Pedro. The garrison made two sorties in the night to hinder this advance at all hazards, but failed, being driven off by the musketry from the second parallel without much difficulty: the force employed, 300 men, was too small. Meanwhile the artillery and sappers were constructing ten batteries, four--and these the largest--in the main frontal attack, but four others on the heights