On September 23, 1823 an armed party of Burmese attacked a British guard on Shapura, an island close to the Chittagong side, killing and wounding six of the guard. Two Burmese armies, one from Mariipur and another from Assam, also entered Cachar, which was under British protection, in January 1824. War with Burma was formally declared on the March 5, 1824. On May 17 a Burmese force invaded Chittagong and drove a mixed sepoy and police detachment from its position at Ramu, but did not follow up its success.
The British rulers in India, however, had resolved to carry the war into the enemys country; an armament, under Commodore Charles Grant and Sir Archibald Campbell, entered the Rangoon river, and anchored off the town on May 10, 1824. After a feeble resistance the place, then little more than a large stockaded village, was surrendered, and the troops were landed. The place was entirely deserted by its inhabitants, the provisions were carried off or destroyed, and the invading force took possession of a complete solitude. On May 28 Sir A. Campbell ordered an attack on some of the nearest posts, which were all carried after a steadily weakening defence. Another attack was made on the June 10 on the stockades at the village of Kemmendine. Some of these were battered by artillery from the war vessels in the river, and the shot and shells had such effect on the Burmese that they evacuated them, after a very unequal resistance.
It soon, however, became apparent that the expedition had been undertaken with very imperfect knowledge of the country, and without adequate provision. The devastation of the country, which was part of the defensive system of the Burmese, was carried out with unrelenting rigour, and the invaders were soon reduced to great difficulties. The health of the men declined, and their ranks were fearfully thinned. The monarch of Ava sent large reinforcements to his dispirited and beaten army; and early in June an attack was commenced on the British line, but proved unsuccessful. On June 8 the British assaulted. The enemy were beaten at all points; and their strongest stockaded works, battered to pieces by a powerful artillery, were in general abandoned.
With the exception of an attack by the prince of Tharrawaddy in the end of August, the enemy allowed the British to remain unmolested during the months of July and August. This interval was employed by Sir A. Campbell in subduing the Burmese provinces of Tavoy and Mergui, and the whole coast of Tenasserim. This was an important conquest, as the country was salubrious and afforded convalescent stations to the sick, who were now so numerous in the British army that there were scarcely 3,000 soldiers fit for duty. An expedition was about this time sent against the old Portuguese fort and factory of Syriam, at the mouth of the Pegu river, which was taken; and in October the province of Martaban was reduced under the authority of the British.
The rainy season terminated about the end of October; and the court of Ava, alarmed by the discomfiture of its armies, recalled the veteran legions which were employed in Arakan, under their renowned leader Maha Bandula. Bandula hastened by forced marches to the defence of his country; and by the end of November an army of 60,000 men had surrounded the British position at Rangoon and Kemmendine, for the defence of which Sir Archibald Campbell had only 5,000 efficient troops. The enemy in great force made repeated attacks on Kemmendine without success, and on December 7, Bandula was defeated in a counter attack made by Sir A. Campbell. The fugitives retired to a strong position on the river, which they again entrenched; and here they were attacked by the British on the 15th, and driven in complete confusion from the field.
Sir Archibald Campbell now resolved to advance on Prome; about 100 m. higher up the Irrawaddy river. He moved with his force on February 13, 1825 in two divisions, one proceeding by land, and the other, under General Willoughby Cotton, destined for the reduction of Danubyu, being embarked on the flotilla. Taking the command of the land force, he continued his advance till March 11, when intelligence reached him of the failure of the attack upon Danubyu. He instantly commenced a retrograde march; on the 27th he effected a junction with General Cottons force, and on April 2 entered the entrenchments at Danubyu without resistance, Bandula having been killed by the explosion of a bomb. The English general entered Prome on the 25th, and remained there during the rainy season. On September 17, an armistice was concluded for one month. In the course of the summer General Joseph Morrison had conquered the province of Arakan; in the north the Burmese were expelled from Assam; and the British had made some progress in Cachar, though their advance was finally impeded by the thick forests and jungle.
The armistice having expired on November 3, the army of Ava, amounting to 60,000 men, advanced in three divisions against the British position at Prome, which was defended by 3,000 Europeans and 2,000 native troops. But the British still triumphed, and after several actions, in which the Burmese were the assailants and were partially successful, Sir A. Campbell, on December 1, attacked the different divisions of their army, and successively drove them from all their positions, and dispersed them in every direction. The Burmese retired on Malun, along the course of the Irrawaddy, where they occupied, with 10,000 or 12,000 men, a series of strongly fortified heights and a formidable stockade. On the 26th they sent a flag of truce to the British camp; and negotiations having commenced, peace was proposed to them on the following conditions:
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