When sudden irregularities of the surface disturbed the order of a column, it halted until the distances were corrected, and then marched silently on with the coolness of a review. Presently the light troops became engaged, the centre broke into columns of regiments, while the left pressed forward rapidly, and the rifles, on the right, bore down on the tirailleurs. Delaborde’s position was now critical, for Ferguson, topping the heights, threatened his rear. But the French general acted promptly--he abandoned the plain, and falling back upon the passes of the Sierra, took up a new position less assailable than the former one; and, from the difficult nature of the mountain surface, requiring, on Sir Arthur’s part, a new disposition of attack. Five separate columns were now formed, and to each a different pass was allotted. The openings in the heights were so narrow and difficult, that only a portion of the columns could come into fire. The pass on the extreme right was attacked by the Portuguese; the light troops of Hill’s brigade and the 5th regiment advanced against the second; the centre was to be carried by the 9th and 29th, the fourth by the 45th, and the fifth by the 82nd. Unfortunately the front attack was made either too soon, or difficulties had delayed the flanking corps--and, in consequence, the passes were all stormed, before Delaborde had been even aware that he was endangered on his flank and rear. Regardless of the ground, than which nothing could be more formidable, the assailants mounted the ravines. Serious obstacles met them at every step--rocks and groves overhung the gorges in the hills--and where the ground was tolerably open for a space from rocks, it was covered thickly with brushwood and wild myrtle. Thus the order of the column was deranged; while a broken surface concealed the enemy, and suffered the French to keep up a withering fusilade on troops who had not leisure to return it. The centre pass, on which the 29th and 9th were directed to advance, was particularly difficult. The 29th led, and the 9th supported it. Entering the gorge undauntedly, the leading companies were permitted to approach a ravine, with precipitous rocks on one side and a thick myrtle wood on the other. From both a tremendous fire was unexpectedly opened. In front and on the flanks, the men fell by dozens; and, as the leading company was annihilated, the column, cumbered by its own dead and wounded, was completely arrested in its movement. But the check was only momentary. Colonel Lake, who led the regiment on horseback, waved his hat and called on the men to follow. A wild cheer was returned, and a rush made up the pass. Notwithstanding the sustained fusilade on every side, the forward movement was successful--and after overcoming every attempt to repel their daring charge, with diminished numbers the 29th crowned the plateau.