The first batteries erected by the engineers proved to be too far distant from the wall of the fort to effect any material damage, and others were commenced at a much shorter range. The work was performed with great difficulty, for the guns of the defenders were well served, and a storm of missiles were poured, night and day, into the town and against the batteries. The garrison, which consisted of eight thousand men, were frequently relieved by fresh troops from the sultan's army, and were thus able to maintain their fire with great vigour. On the 17th, Tippoo cannonaded the British camp from a distance, but without doing great damage. In the meantime, the fire of our siege guns was steadily doing its work, in spite of the heavy fire kept up on them. The stone facing of the bastion next to the gateway was soon knocked away, but the earth banks behind, which were very thick and constructed of a tough red clay, crumbled but slowly. Still, the breach was day by day becoming more practicable, and Tippoo, alarmed at the progress that had been made, moved his army down towards the east side of the fort, and seemed to meditate an attack upon our batteries. He placed some heavy guns behind a bank surrounding a large tank, and opened some embrasures through which their fire would have taken our trenches, which were now pushed up close to the fort, in flank. Lord Cornwallis at once directed a strong force to advance, as if with the intention of attacking the new work, and Tippoo ordered his troops to retire from it. It was evident, however, that he had determined to give battle in order to save the fort, and the English general therefore determined to storm the place that very night, the 21st of March. The preparations were made secretly, lest the news should be taken to Tippoo by one of the natives in the town, and it was not until late in the evening that orders were issued to the troops which were to take part in the assault. The column was to be composed of the grenadier and light companies of all the European regiments, and these were to be followed and supported by several battalions of Sepoys. The force, commanded by Colonel Maxwell, at eleven o'clock issued from the town and advanced through the trenches. The besieged were vigilant, and the instant the leading company sprang from the trenches and, in the bright moonlight, ran forward to the breach, a number of blue lights were lighted all along the ramparts, and a heavy musketry fire was opened. The scene was eagerly watched by the troops in the camp, every feature being distinctly visible. The storming party could be seen, rushing up the breach and mounting, by ladders, over the gateway, which was the central object of attack. The enemy gathered in masses at the top of the breach, but as soon as the stormers collected in sufficient strength, and charged them with the bayonet, they broke and dispersed.