During the night the vigilant governor expecting the assault mounted two field-pieces on the cavalier, in the centre of the land front, which being fifteen feet above the other defences commanded the high curtain, and they still had on the horn-work a light piece, and two casemated guns on the flank of the cavalier. Two other field-pieces were mounted on an entrenchment which crossing the ditch of the land front bore on the approaches to the main breach; a twenty-four pounder looked from the tower of Las Mesquitas, between the main breach and where the third opening was being made and consequently flanking both; two four-pounders were in the tower of Hornos; two heavy guns were on the flank of St. Elmo, and two others, placed on the right of the Mirador, could play upon the breaches from within the fortified line of Monte Orgullo. Thus fourteen pieces were still available for defence, the retaining sea-wall or _fausse braye_ which strengthened the flank of the horn-work, and between which and the river the storming parties must necessarily advance, was covered with live shells to roll over on the columns, and behind the flaming houses near the breach other edifices were loop-holed and filled with musqueteers. However the fire extending rapidly and fiercely greatly injured the defences, the French to save their guns withdrew them until the moment of attack, and the British artillery officers were confident that in daylight they could silence the enemy’s guns and keep the parapet clear of men; wherefore sir Thomas Graham renewed the order for THE ASSAULT. In the night of the 24th two thousand men of the fifth division filed into the trenches on the isthmus. This force was composed of the third battalion of the royals under major Frazer, destined to storm the great breach; the thirty-eighth regiment under colonel Greville, designed to assail the lesser and most distant breach; the ninth regiment under colonel Cameron, appointed to support the royals; finally a detachment, selected from the light companies of all those battalions, was placed in the centre of the royals under the command of lieutenant Campbell of the ninth regiment. This chosen detachment, accompanied by the engineer Machel with a ladder party, was intended to sweep the high curtain after the breach should be won.