General Sir Douglas Haig also congratulated the Fourth Army in the following terms:
O.A.D.151, September 17.
General Sir H. Rawlinson,
Commanding Fourth Army.
The great successes won by the Fourth Army on the 15th are most satisfactory, and have brought us another long step forward towards the final victory. The further advance yesterday after such severe fighting was also a fine performance highly creditable to the troops and to Corps, Divisional, and Brigade Staffs. Our new engine of war, the Heavy Section Machine-gun Corps, acquitted itself splendidly on its first trial, and has proved itself a very valuable addition to the Army. My warmest congratulations to you and the Fourth Army on a very fine achievement.
D. Haig, General,
Commanding-in-Chief, British Armies in France.
The following letters passed between the Commanders-in-Chief of the British and French Armies:
September 17, 1916.