DEFENCE ORGANIZATION A defended port (coast fortress) is under a fortress commander who arranges the co-operation with navy and air force. A large place is divided into sections, each under a commander in charge of all troops in his section. The coast artillery is divided into groups of batteries, called fire-commands, each under an officer. Such a group generally consists of batteries which fire over the same area of water. A fire-command lies wholly in one section.
The tactical control of observation and illuminated area search lights is exercised by the fire-commander through an electric light director. Fighting lights are controlled by the battery com mander whom they serve.
BIBLIOGRAPHY.-Sir G. Clarke, Fortification (19o7), the subject Bibliography.-Sir G. Clarke, Fortification (19o7), the subject generally. Military Engineering, vol. ii., "Defences" (1925) ; Anti Aircraft Defence, Part I. (1922). These two books enter into details and are published by authority by H. M. Stationery Office.
(J. C. M.)