On the death of Thakombau's personal enemy Rewa was glad enough to make peace with Mbau, but the Mbau rebels, who had to fear reprisals, continued the struggle. But in March King George of Tonga arrived at Mbau with forty large canoes to take away the war-canoe presented to him by Thakombau. After trying in vain to bring about a reconciliation, and suffering the loss of one of his own chiefs through the treachery of the rebels, King George agreed to lend his troops to Thakombau. The prospect of this foreign interference so incensed the people that tribes which had hitherto taken no part in the struggle threw in their lot with the rebels, and every one who opposed Christianity, or had anything to fear from Mbau, joined the enemy. The priests were inspired; the oracles spoke. The Tongan fleet would be derelict at Kamba for want of hands to work the sails after the battle. It was to be a death-struggle between the old gods and the new.
The promontory of Kamba was to be the battlefield, and the fortress at its extremity swarmed with warriors. For three days the allied fleets waited near the fort in the hope that it would capitulate without a siege, but on April 7 they bore down upon the promontory--a formidable spectacle. They were received with a volley of musketry. By all the rules of Fijian warfare this should have checked the landing for that day, but to the astonishment of the Kambans it did nothing of the sort. The sails were lowered, and, leaving their dead and wounded to the care of their women, the Tongans rushed to the attack. There were more surprises in store for the garrison; instead of hiding behind trees, and trying to scare the defenders into flight, the Tongans advanced to the assault in the open, and recked nothing of the men who fell. King George, who commanded in person, had decided to invest the town by throwing up fortifications fronting the defences, and to starve it into submission, but the Vavau warriors pressed on, and took the place by assault. They afterwards defended themselves for this act of insubordination by saying that they were looking for the defences, and, taking the rampart for mere outworks, had found themselves in possession of the town before they were aware of their mistake--a familiar form of Tongan boasting. The Tongans lost fourteen killed and thirty wounded; the Mbauans, who had been mere spectators, escaped almost scatheless. More than two hundred of the enemy were killed, the greater part by the heathen Fijians on the Mbau side, and two hundred prisoners were taken. Thakombau was willing to spare all but Koroi-ravula, but King George interfered to save his life, which was justly forfeited by European as well as Fijian law. The submission of the rebels was complete. No less than twenty thousand natives proved their allegiance to Thakombau by accepting Christianity and adapting their customs to the wishes of the missionaries.