This, as I say, I learnt later in France; at the time I only knew that the advance-guard of millions was marching.  As I watched them my eyes grew misty.  Troops who have already fought no longer stir me; they have exchanged their dreams of glory for the reality of sacrifice—­they know to what they may look forward.  But untried troops have yet to be disillusioned; dreams of the pomp of war are still in their eyes.  They have not yet owned that they are merely going out to die obscurely.

That day made history.  It was then that England first vividly realised that America was actually standing shoulder to shoulder at her side.  In making history it obliterated almost a century and a half of misunderstanding.  I believe I am correct in saying that the last foreign troops to march through London were the Hessians, who fought against America in the Revolution, and that never before had foreign volunteers marched through England save as conquerors.

On my recovery I was sent home on sick leave and spent a month in New York.  No one who has not been there since America joined the Allies can at all realise the change that has taken place.  It is a change of soul, which no statistics of armaments can photograph.  America has come into the war not only with her factories, her billions and her man-power, but with her heart shining in her eyes.  All her spread-eagleism is gone.  All her aggressive industrial ruthlessness has vanished.  With these has been lost her youthful contempt for older civilisations, whom she was apt to regard as decaying because they sent her emigrants.  She has exchanged her prejudices for admiration and her grievances for kindness.  Her “Hats off” attitude to France, England, Belgium and to every nation that has shed blood for the cause which now is hers, was a thing which I had scarcely expected; it was amazing.  As an example of how this attitude is being interpreted into action, school-histories throughout the United States are being re-written, so that American children of the future may be trained in friendship for Great Britain, whereas formerly stress was laid on the hostilities of the eighteenth century which produced the separation.  As a further example, many American boys, who for various reasons were not accepted by the military authorities in their own country, have gone up to Canada to join.

One such case is typical.  Directly it became evident that America was going into the war, one boy, with whom I am acquainted, made up his mind to be prepared to join.  He persuaded his father to allow him to go to a Flying School to train as a pilot.  Having obtained his certificate, he presented himself for enlistment and was turned down on the ground that he was lacking in a sense of equipoise.  Being too young for any other branch of the service, he persuaded his family to allow him to try his luck in Canada.  Somehow, by hook or by crook, he had to get into the war.  The Royal Flying Corps accepted