Led in its progress to consult old documents and returns, I conceived the idea of making myself acquainted with the whole history of the corps. With this view, after daily fulfilling the routine duty of the office, I spent all my leisure intervals in bringing to light old books and papers, which for years had been buried in disused depositories and stores. Whilst thus engaged, two Acting Adjutants, Lieutenants F. A. Yorke and T. Webb, R.E., were successively appointed to the corps at Woolwich. Both officers entered with some spirit into the attempt to trace a history of its services; but before they had proceeded to any great length, were interrupted in their labours by removal to other stations in consequence of promotion. Adjutant Yorke, however, succeeded so far, that he drew up a brief account of the formation of the sappers, commencing with the Gibraltar company in 1772, and detailed its subsequent augmentations and reductions. This statement also forms a permanent record in the office; and Captain Webb made fair progress with an outline account of its active services. To both officers it was my good fortune to afford such aid as they required, in the collection of information for their respective efforts. In 1847, when medals were granted to the veterans of the last war, Brigade-Major, now Colonel Sandham, observed the readiness with which I spoke of historical events in which the corps was concerned, and of the services of particular individuals who had belonged to it. He also saw the facility with which I supplied the information required to establish the claims of the several applicants for medals and clasps. This induced him, after some little conversation on the subject, to direct me to prepare for publication a history of the corps. Much fragmentary matter I had already accumulated, for twelve years had been consumed by me in wading through books and documents in quest of dates and occurrences. Nevertheless, it was not without serious misgivings that I set myself officially to the task, and the researches and labours embodied in the following pages are the result. In the intervals of important and onerous public duty, the materials for the memoir have been collected and the work methodized and written. Necessarily severe was the application required under such circumstances; but by steady perseverance, even at times when my health was scarcely able to bear up against the exertion it needed, I have succeeded, without omitting any service that I know of, in completing the history to the siege of Sebastopol.