During the later months of the year the detachment repaired Fort Morales, and the lines on the western heights of Passages. There also they fitted up barracks for the royal marines, and strengthened the advanced picket-house. Four of the men superintended a working party of the royal marines in completing and arming the redoubts around San Sebastian, in which service much difficulty was experienced from the want of an adequate working party and materials. So impoverished were the stores, that to provide planks and sleepers for the platforms and magazines, recourse was had to old splintered timbers from ruined sheds and buildings. Among other services performed by the detachment was the construction of a redoubt at Cachola on the high road from San Sebastian to Hernani, to protect that communication. On the 13th May, six rank and file were attached to Captain A. Henderson, R.E., and were employed for the fourth summer under his direction in the trigonometrical survey of the western coast of Scotland for the Admiralty. The nature of the operations, as on former occasions, necessitated their encampment on the mountains; and when the service closed in November, the party returned to Woolwich. Lord Hill and Sir Hussey Vivian, the Master-General, inspected the seventh company and detachment of the corps at Chatham on the 15th June, and afterwards witnessed the siege operations carried on by the troops and sappers under Colonel Warre. At the steadiness of the latter on parade, and the able manner in which the siege details were executed, his lordship expressed the highest gratification; and Colonel Warre, in his public orders of 16th June, also eulogised the corps for the cheerful and indefatigable manner in which they had worked in the field, adding, “that the construction of the works did credit to their skill as engineer workmen, and their appearance to their discipline and efficiency as soldiers.” Second-Captain Henry Sandham, R.E., by commission dated 1st August, was appointed adjutant to the corps at Chatham vicê Captain Jebb promoted. The latter had filled the office with much advantage to the public service; and his many excellent qualities, as evinced in the discharge of his duties, commanded the esteem of the corps, and caused him to be much regretted at his leaving.