ins were considerable, the front line being advanced by from 2,500–3,500 yards (2,300–3,200 m) and many casualties were inflicted on the German defenders. The battle was the début of the Canadian Corps, New Zealand Division and tanks of the Heavy Branch of the Machine Gun Corps on the Somme.
Battle of Morval, 25–28 September
The Battle of Morval was an attack by the Fourth Army on Morval, Gueudecourt and Lesboeufs held by the German 1st Army, which had been the final objectives of the Battle of Flers–Courcelette (15–22 September). The attack was postponed to combine with attacks by the French Sixth Army on Combles, south of Morval and because of rain. The combined attack was also intended to deprive the German defenders further west, near Thiepval of reinforcements, before an attack by the Reserve Army, due on 26 September. Combles, Morval, Lesboeufs and Gueudecourt were captured and a small number of tanks joined in the battle later in the afternoon. Many casualties inflicted on the Germans but the French made slower progress. The Fourth Army advance on 25 September was its deepest since 14 July and left the Germans in severe difficulties, particularly in a salient near Combles. The Reserve Army attack began on 26 September in the Battle of Thiepval Ridge.
Battle of the Transloy Ridges, 1 October – 11 November
The Battle of Le Transloy began in good weather and Le Sars was captured on 7 October. Pauses were made from 8–11 October due to rain and 13–18 October to allow time for a methodical bombardment, when it became clear that the German defence had recovered from earlier defeats. Haig consulted with the army commanders and on 17 October reduced the scope of operations by cancelling the Third Army plans and reducing the Reserve Army and Fourth Army attacks to limited operations, in co-operation with the French Sixth Army. Another pause followed before operations resumed on 23 October on the northern flank of the Fourth Army, with a delay during more bad weather on the right flank of the Fourth Army and on the French Sixth Army front, until 5 November. Next day the Fourth Army ceased offensive operations, except for small attacks intended to improve positions and divert German attention from attacks being made by the Reserve/Fifth Army. Larger operations resumed in January 1917.
Battle of Thiepval Ridge, 26–28 September
The Battle of Thiepval Ridge was the first large offensive mounted by the Reserve Army of Lieutenant General Hubert Gough and was intended to benefit from the Fourth Army attack at Morval by starting 24 hours afterwards. Thiepval Ridge was well fortified and the German defenders fought with great determination, while the British co-ordination of infantry and artillery declined after the first day, due to confused fighting in the maze of trenches, dug-outs and shell-craters. The final British objectives were not reached until the Battle of the Ancre Heights (1 October – 11 November). Organisational difficulties and deteriorating weather frustrated Joffre's intention to proceed by vigorous co-ordinated attacks by the Anglo-French armies, which became disjointed and declined in effectiveness during late September, at the same time as a revival occurred in the German defence. The British experimented with new techniques in gas warfare, machine-gun bombardment and tank–infantry co-operation, as the Germans struggled to withstand the preponderance of men and material fielded by the Anglo-French, despite reorganisation and substantial reinforcements of troops, artillery and aircraft from Verdun. September became the worst month for casualties for the Germans.
Battle of the Ancre Heights, 1 October – 11 November
The Battle of the Ancre Heights was fought after Haig made plans for the Third Army to take the area east of Gommecourt, the Reserve Army to attack north from Thiepval Ridge and east from Beaumont Hamel–Hébuterne and for the Fourth Army to reach the Péronne–Bapaume road around Le Transloy and Beaulencourt–Thilloy–Loupart Wood, north of the Albert–Bapaume road. The Reserve Army attacked to complete the ca