At last, on September 4, the siege-train arrived, a long line of heavy guns and mortars drawn by elephants, with miles of bullock-carts loaded with shot and shell and ammunition of all kinds, enough to grind Delhi to powder. During the next week all energies were strained to make ready for the assault. Nicholson and Baird Smith had settled the plan. The most vulnerable part of the wall lay between the Water gate and the Mori bastion. Upon this it was decided to concentrate the artillery fire. On the night of September 6, the first battery was begun just below the Sami-house, a half-ruined mosque six hundred yards from the city, and next day, when it was completed and began to belch its shot on the doomed walls, strong pickets took advantage of the distraction to occupy Ludlow Castle, a large country-house of European make towards the left of the position, and the Kudsia gardens opposite the Kashmir gate and overlooking the river. Each night a new battery was erected and armed, to begin each morning its fierce work. The second battery stood in front of Ludlow Castle, five hundred yards from the walls; the third, consisting of four heavy mortars, was made in the Kudsia gardens, and placed in command of the gallant Major Tombs; the fourth, a triumph of the daring and skill of Captain Taylor of the Engineers, had crept within a hundred and sixty yards of the Mori bastion. Nor were these feats of engineering done without loss. As soon as the rebels perceived what was afoot, they directed a storm of musketry on the heroic workers who toiled day and night in the hot moist air. British and natives, officers and men, soldiers of all arms--for Lancers and Carabineers lent a hand in the work--laboured incessantly with unflinching courage. As soon as one man was killed or disabled, another took his place. By the night of the 11th, all the batteries were complete, and on the 12th more than fifty guns and mortars were pounding the walls. The din was deafening, and mingled with the roar of the guns was the crash of shattered masonry as the red walls crumbled away. At nightfall every post of vantage on the Ridge was crowded with sightseers, watching the living shell flying through the air like falling meteors. The rebels at first attempted to answer the fire, but the gunners could not hold their posts on the shot-swept ramparts. Parties of rebel horse sallied forth from time to time, as if to charge the batteries; but they were met by showers of grape-shot, or set upon by troops of Hodson's Horse, which drove them back in frantic haste to find cover. Nicholson rode from battery to battery, encouraging the men, taking counsel with Baird Smith, watching the effect of these tremendous salvos that shook the ground.