I cannot hope that I have succeeded in conveying to readers of this volume an adequate conception of the great and marvellously successful performance that it was or a full appreciation of what immense difficulties the staff had to contend with.

They were very completely realized by me, who saw them appear day by day and disappear under treatment.
The head of the organization was, of course, Rear-Admiral A.L.Duff, the member of the Board and Staff immediately responsible also for the whole anti-submarine organization.

Only those who witnessed Admiral Duff's work at the Admiralty during 1917 can realize the immense debt that the country owes to his untiring ability, patience, energy and resource.
Capt.

H.G.Henderson, who had been associated with the convoy system from its start, was an invaluable assistant, as also was Commander I.W.
Carrington.Capt.Richard Webb, the Director of the Trade Division, and Capt.

Frederic A.Whitehead, the Director of the Mercantile Movements Division, took an important share in the work of organization, whilst the work of Convoy Manager was carried through with quite exceptional skill by Paymaster-Commander H.W.E.