(d.) A Submarine Mining Battalion, consisting of one depôt and 11 service companies (the old Nos. 4, 21, 22, 27, 28, 30, 33, 34, 35, 39, and 40), numbering about 760 of all ranks. Their strength varies according to the locality in which they are employed.
(e.) A Coast Battalion of 3 divisions, altogether about 240 of all ranks, employed in defensive works on the sea-coast.
(f.) 4 Survey Companies (Nos. 13, 14, 16, and 19), 330 men in all, engaged in the Ordnance and other official Surveys.
(g.) 17 Fortress Companies, of varying strengths (Nos. 1, 2, 3, 5, 6, 9, 15, 18, 20, 24, 25, 29, 31, 32, 36, 41, and 42), which are employed in the repair and keeping up of fortresses. In war-time they would design and execute siege-batteries, parallels, and all work connected with either the attack or defence of fortresses. In peace-time they number altogether about 1600 men.
(h.) 8 Depôt Companies, which are employed in the training and drilling of recruits, and in work relating to the Corps. They number 820 men.
(i.) 2 Railway Companies (Nos. 8 and 10), which number 140 men together, and would be employed in the laying and repairing of railway lines on service.
(k.) A Supernumerary Staff of nearly 400 men, which is employed in a great variety of duties too numerous to mention.
420 more men are distributed in different parts of the world and in military schools of different sorts.
The grand total of Royal Engineers in peace-time is therefore about 7,300 men.