To obtain a religious protectorate in Turkey, Russia menaced the independence of the Sultan, which led to a long diplomatic negotiation between the Western powers and the Czar; but as the Emperor Nicholas persisted in interfering with the rule of the Sultan, and attempted to enforce his pretensions by occupying with a belligerent army the Danubian principalities, Great Britain and France declared war against Russia. Measures were instantly taken to give effect to the declaration by despatching powerful expeditions to the East and the Baltic. To the Baltic fleet were attached, on the 9th March, one sergeant and nineteen rank and file of the second company, under the command of Lieutenant Nugent of the engineers, which embarked at Portsmouth on board the ‘Duke of Wellington,’ flag-ship of Vice-Admiral Sir Charles Napier, and accompanied it in its reconnaissance of the Baltic Sea and the Gulf of Finland as far up as Cronstadt. The object of sending the party with the fleet was, that it might take the lead of the seamen and marines in any escalading operations ashore; but the nature of the service was such that no occasion offered for resorting to the expedient. During the time that the cholera was rife in the fleet, several of the detachment were seized with the malady, and three died. When it was resolved to make a descent upon the Aland Islands, a division of the French army was despatched from Calais to carry out the enterprise. The second company, of eighty strong, under Captain F. W. King, royal engineers, was added to the force, and sailing from Deptford in the ‘Julia’ transport on the 15th July, with every conceivable engineering requirement, arrived at Calais on the 17th, and took on board 225 officers, non-commissioned officers, and rank and file of the 51st infantry of the line. The sappers were the only troops that accompanied the French contingent. Before daylight on the 8th August, the second company, 600 of the royal marines, and 2000 French troops landed at a small cove a few miles N.E. of Bomarsund, and taking a winding route by the village of Monkstetta, encamped about 1,200 yards from Fort Tzee, sheltered by a hill on which the breaching battery was afterwards constructed. The advance of the van was formed by the sappers from the flag-ship, carrying besides their carbines an assortment of bill-hooks, hand-saws, axes, and hatchets, and the column was closed in rear by the second company under Captain King. The British operations were wholly carried out under the direction of Brigadier-General Jones, R.E., an officer of matured judgment and experience, gained by hard service in the Peninsular War, and by some forty years of after study and experiment. He was assisted by Captain H. St. George Ord, and four other officers of the corps.