By the augmentation of this company the establishment of the corps was increased to thirteen companies, of 814 of all ranks, including the staff. The first detachment of one colour-sergeant and twenty rank and file was conveyed to Dublin in March under the command of Lieutenant Edward Vicars, R.E., and was soon removed from Mountjoy to Dromore, where, in April, further reinforcements arrived, completing the company to its establishment; and the whole were distributed in small sections to Antrim, Belfast, Coleraine, Dungiven, Londonderry, &c., from whence the corps, by degrees, traced its progress all over Ireland. Major Reid was appointed to command the _first_ survey company, which was numbered the thirteenth. On the 24th March, the sixth company, of sixty-two total, sailed for Corfu on board the ‘Baltic’ merchant transport, and landed there on the 14th May. This addition to the command was made at the instance of the Ionian government for the purpose of executing the works and fortifications at Corfu and Vido. By the warrant for raising this company, dated 4th April, 1825, the corps mustered fourteen companies, and counted 876 officers and soldiers of all ranks. All the regimental and working disbursements of the company, and of others arriving at the station in periodical relief, were for a number of years paid from the Ionian exchequer. While the instruction of the first survey company was still in progress, steps were taken for the formation of another company for the same service. The Duke of Wellington expressed his conviction of the propriety of the measure from the satisfactory advancement already made in the professional education of the company raised for the duty early in the year. On the 4th April, 1825, therefore, his Grace obtained another warrant for the employment of a second company in the operations of the survey of Great Britain and Ireland. This company was numbered the fourteenth; and being of the same numerical organization as the other companies, viz., sixty-two men, the establishment of the corps was raised from 876 to 938.