Pr@face 
statements so that they may at least prove 
of assistance to any one who may hereafter 
work up the subject as it deserves. I had 
hoped to delay the publication of my book 
until after the declaration of peace, when I 
might have had leisure to sift and to elaborate 
my notes, but this hope has been frustrated 
by the knowledge that more important work 
will then confront me; I have therefore felt 
compelled to publish them as they now stand. 
I must thank my friend Captain Harold 
Stannard for his assistance in preparing my 
notes for publication and also for reading 
the proofs of the book. As regards the pic- 
tures and photographs which I have been 
enabled to reproduce as illustrations, I am 
indebted to the courtesy of the Imperial 
War Museum (Photographic Section) for 
Plates 1,2, 7, 8, 12,13, 15,16, and 17 ; to the 
Canadian War Records Office for Plates 3 
and 4; tothe Associated Illustration Agencies, 
Ltd., for Plate 5; to Mr. F. W. Frohawk 
and the Editor of The Field for Plate 6; to 
the Alfieri Picture Service for Plate 9; to 
the London Electrotype Agency, Ltd., for 
Xi 
