On the 25th of February Admiral Vernon again sailed on an expedition against Carthagena, but finding his force inadequate to reduce it, after refitting at Porto Bello, he proceeded to the river Chagres, an accurate chart of which he had obtained from the pirate Lowther, who, by doing this piece of service, had his majesty's pardon granted him. The castle of San Lorenzo was quickly captured, and a large amount of merchandise and plate found in the place. After blowing up the fortifications, and destroying two guarda costas, he returned to Jamaica. He next, being joined by Sir Challoner Ogle with a large body of troops, attacked Carthagena; forcing a beam which had been laid across the harbour, the fleet entered and blew up a considerable number of forts, great gallantry being shown by the commanders of the ships of war and their crews. The British troops, however, were repulsed with great slaughter in their attempts to storm Fort Saint Lazare. In consequence of sickness, it became at length necessary to raise the siege, and the admiral returned to Jamaica. The establishment of a settlement on the island of Rattan and an attack on Cuba were designed by Admiral Vernon, but this and other plans were thwarted by the commander of the land forces, General Wentworth--showing the inconvenience which, in nearly all instances, arises from a division of command. Probably, had the whole power been vested with Admiral Vernon, his plans would have succeeded. Soon after his arrival in England, in consequence of a disagreement with the Admiralty, he was deprived of his command in 1746, after which he did not again go to sea. Probably in consequence of observing the ill effects of undiluted spirits among his crews in the West Indies, he was the first to order a sailor's allowance of rum to be mixed with water, to which the name of grog has since been given.