[Illustration: COLONEL ARDANT DU PICQ] 

[Illustration:
Letter from Marshal Foch to Major General A.  W.  Greely
Dated Malsherbe, October 23, 1920] 

TRANSLATION OF A LETTER FROM MARSHAL FOCH TO MAJOR GENERAL A.  W.
GREELY, DATED MALSHERBE, OCTOBER 23, 1920 

MY DEAR GENERAL: 

Colonel Ardant du Picq was the exponent of _moral force_, the
most powerful element in the strength of armies.  He has shown it to
be the preponderating influence in the outcome of battles. 

Your son has accomplished a very valuable work in translating his
writings.  One finds his conclusions amply verified in the
experience of the American Army during the last war, notably in the
campaign of 1918.