THREE:While an impulse was thus given to the mathematical theory of light in the University of Cambridge, similar progress was being made in the sister University of Dublin, where three of her most eminent professorsSir William Rowan Hamilton, Dr. Lloyd, and Mr. M'Cullaghdevoted themselves energetically to its improvement and verification. Sir William Hamilton, a geometer of the first order, having undertaken a more complete discussion of the wave surface of Fresnel, to the equation of which he gave a more elegant form, ascertained the exact nature of that surface, and consequently the exact direction of refracted rays in the neighbourhood of the optic axes. The beautiful and unexpected results he obtained were verified by his friend Dr. Lloyd. The names of Sir William R. Hamilton and Dr. Lloyd will be handed down to posterity in connection with this discovery. "But," says Professor Forbes, "they have other claims to our respect. The former has generalised the most complicated cases of common geometrical optics, by a peculiar analysis developed in his essays on 'Systems of Rays.' To Dr. Lloyd we are indebted for several interesting experimental papers on optics, for an impartial review of the progress of the science, and for an excellent elementary treatise on the wave theory."On the 12th of February, 1843, Outram persuaded the Ameers, who were in deadly fear of Napier, to sign the treaty. But the negotiator, who continued to place implicit confidence in the pacific professions of the Ameersthey being anxious to gain time till the hot weather should come, and give them an advantage against their enemieswas convinced of his mistake by a treacherous attack made on the British residency; the Ameers boasting that "every man, woman, and child belonging to the British army in Scinde should be collected on the field of battle, and have their throats cut, except the general, who should be led, chained, with a ring in his nose to the durbar." Outram's garrison consisted only of 100 soldiers, with forty rounds of ammunition each, with which he had to defend himself against 8,000 men with six guns. The British fired with effect from behind a wall till their ammunition was exhausted, when they slowly retired till they got safe on board the British steamers, protected by their guns, which swept the flank of the enemy. The war had now come in earnest, and so Sir Charles Napier resolved to show the Ameers what British troops could do. The odds were greatly against him, for he had but 8,600 men, of whom only 400 were Europeans, with which he was to engage an army 22,000 strong, with 5,000 horse, and fifteen guns, all well posted in a strong position at Meeanee. It required marvellous hardihood in the veteran warrior of the Peninsula to enter upon such an unequal contest. But it was the first time that the ambition of his life was realisedin being placed in a position of supreme commandand he longed to show the world how worthily he could have filled it long ago. The officers who fought under him in that memorable battle deserve to be mentioned. Major Lloyd commanded the Artillery, Captain Henderson the Sappers and Miners; next to them stood the 22nd, commanded by Colonel Pennefather; Colonel Teesdale led the 25th Sepoys; Colonel Read the 12th Native Infantry; Major Clibborne the Bengal Engineers; Colonel Pattle the 9th Bengal Horse; and Captain[592] Tait the Poonah Horse. The plain between the two armies was about 1,000 yards in breadth. The space was rapidly passed over. Napier's men rushed forward, and crossing the bed of a river which intervened, they ran up the slope, while the artillery of the Beloochees fired over their heads. Reaching the summit, they beheld, for the first time, the camp of the enemy, which was carried by the 22nd. The Native Infantry also behaved well, and while the little army was doing terrible execution upon the enemy, the artillery swept their ranks with shot and shell. Nevertheless, they fought bravely, and held their ground for three hours in a hand to hand encounter with their assailants. The chasms which were repeatedly made by the guns in the living mass were quickly filled up by those behind rushing forward to the conflict. The pressure of numbers bearing down the hill seemed more than once on the point of overwhelming the British, and obliterating their "thin red lines." Nearly all the officers were killed or wounded. Everything now depended upon the cavalry, which were commanded by Colonel Pattle, who was ordered to charge instantly. They went at full gallop through the jungle: fifty were thrown off their horses, but the rest pressed on, ascended the ridge of the hill, dashed into the thick of the enemy's ranks, fiercely cutting their way with their swords right and left, trampling down the men under their horses' feet, never ceasing till they had traversed the whole camp. The confusion and wavering thus occasioned gave courage to the infantry. The Irish and the Sepoys, raising the cry of victory, pressed on with fury, drove the enemy back down the hill, and compelled them to retreat, abandoning their guns, their ammunition, and their baggage, leaving their dead on the field, and marking their course by a long train of killed and wounded. Their loss was estimated at 5,0001,000 bodies being found in the bed of the river. The British loss was almost incredibly small: six officers and fifty-four privates killed, fourteen officers and 109 men wounded.
