_The Franco-British troops enlarge the conquered positions and attack
the centres of resistance: Combles and Thiepval (July 14--September
1)._]
[Illustration: _Combles and Thiepval turned and conquered, after being
surrounded (September--November)._]
[Illustration: _The Allies advance toward their main objectives:
Bapaume and Péronne (November--March)._]
[Illustration: SOUTH OF THE SOMME.
_The 6th Army (French) held by the Somme Marshes, took up its
new position. The 10th Army (French) assembled on its right
(August--September)._]
[Illustration: _The 10th Army attacked, but was held in front of
Chaulnes (September--October)._]
[Illustration: _The 10th Army (French) failed to encircle Chaulnes, and
consolidated its new positions (October--November)._]
[Illustration: FIELD-MARSHAL HAIG.]