The British summer attack at the Somme took place while the two sides
continued to claw at one another at Verdun. Contrary to plans worked out
the previous winter, the French could not participate fully in a joint attack.
Nonetheless, the British took up their offensive with vast optimism.
The new British commander. General Sir Douglas Haig, planned a
breakthrough at the Somme based on a prolonged artillery barrage followed
by a rapid advance by his forces. Hundreds of thousands of
volunteers, many from the nation's upper classes, had poured into military
service since 1914. The "New Army" they had formed consisted of raw
but enthusiastic divisions, and the Somme offensive was to be their
baptism of fire. Cavalry forces were waiting behind the lines to exploit
the forthcoming breakthrough and to take the war into a decisive phase
in open country.
Nothing of the sort occurred. Surviving German machine gunners in the
front lines combined with German artillerymen to slaughter the advancing
British. Although the first day's assault (on July 1 ) ended with minimal gains
and unprecedented casualties—the British loss of 20,000 killed and 40,000
wounded stands as a uniquely bloody set of casualties for a single day in
any war—Haig continued the offensive for several months. As at Verdun,
the defenders suffered grim losses while the battle line scarcely moved
forward or backward. As at Verdun, both sides seemingly absorbed their
losses and looked to another year of campaigning in 1917.