shown graphically below.

C.N.S.
|
+-- D.C.N.S.
| . |
| . +-- Operations Division.
| . | |
| . | +-- Home
| . | +-- Foreign
| . +-- Mobilization Division.
| . +-- Signal Section.
| . +-- Intelligence Division.
| .
+-- A.C.N.S.
|
+-- Trade Division.
+-- Convoys Section.
+-- Anti-Submarine Division.
+-- Mine-Sweeping Division.

Stress was laid in a Staff memorandum issued by me on the fact that the
various divisions were on no account to work in watertight compartments,
but were to be in the closest touch with one another. The dotted line
connecting the D.C.N.S. and the A.C.N.S. in the graph was defined as
indicating that there should be the fullest co-operation between the
different portions of the Staff.

In the summer of 1917 the growth of the convoy system necessitated
further expansion of the Naval Staff, and a Mercantile Movements
Division was added. The duties of this division were to organize and
regulate the movements of convoys of merchant ships. A staff of officers
had been by this time sent abroad to the ports from which convoys were
directed to sail, and the Mercantile Movements Division, acting in close
touch with the Ministry of Shipping, arranged the assembly and movements
of the convoys and their protection.

The organization of the portion of the Staff under the A.C.N.S. at this
stage is shown below.

A.C.N.S.
|
------------------------------------------------
| | | |
Director of Director of Director of Director of
Mercantile Trade Anti-Sub- Mine-Sweeping
Movements Division. marine Division.
Division. (Captain R.N.) Division. (Captain R.N.)
(Captain R.N.) | (Captain R.N.) |
| Staff. | Staff.
-------------- Staff.
| |
Convoy Movements
Section. Section.

The portion of the organization under the A.C.N.S. comprised the
following numbers in December, 1917:

Mercantile Movements Division, 36 Officers, with a clerical staff.

Trade Division, 43 Officers, with a clerical staff of 10 civilians.

Anti-Submarine Division, 26 Officers, with a clerical staff.

Mine-Sweeping Division,