Having, so far, failed in all his undertakings, the Lord of the White Elephant now sent his two brothers, the Prince of Tonghoo and the Prince of Sarrawaddy, with a whole host of astrologers and a corps of "Invulnerables," to join the army and to direct the future operations of the war. The astrologers were to fix the lucky moment for attacking; the "Invulnerables" had some points of resemblance to the Turkish Delhis; they were the desperadoes, or madmen, of the army, and their madness was kept up by enormous doses of opium. The corps consisted of several thousand men, divided into classes; the most select band of all being called the "King's Own Invulnerables." The Prince of Tonghoo established his headquarters at Pegu, and the Prince of Sarrawaddy took post at Donoopew, upon the great river, about sixty miles from Rangoon. In the beginning of August the Prince of Sarrawaddy sent down a force to occupy a strong post at the mouth of the Pegu River, a few miles below Rangoon, giving his people strict orders to block up the channel of the river in our rear, so that not one of the "wild foreigners" or "captive strangers" might escape the punishment that was about to fall upon them. Brigadier Smelt was at once sent, with a small corps, to dislodge Sarrawaddy's force. Our land troops were brought to a standstill, when within musket-shot of the place, by a deep and impassable creek; but a party of sailors from his Majesty's ship _Larne_, under Captain Marryat, threw a bridge over the creek; and, as soon as the column of attack pushed forward, the enemy began to fly, leaving eight guns and a quantity of ammunition in their stockade. A strong pagoda, with a numerous garrison, and with cannons pointing down every approach, was next carried with equal facility. Other posts on the rivers and creeks were then attacked and taken. Such of the enemy as had had any experience of our way of fighting seldom stopped to fight in their stockades; but a new set of people from the interior made a good stand in a succession of stockades on one of the rivers, and cost us the loss of a good many brave men.