Trench warfare begins
Where did Britain and France face an uninterrupted line of entrenched German forces, from Lorraine to where?
World War I
Western Front. Trench warfare begins. Military tactics before World War I had failed to keep pace with advances in technology. These advances allowed for impressive defence systems, which out-of-date military tactics could not break through for most of the war. Barbed wire was a significant hindrance to massed infantry advances. Artillery, vastly more lethal than in the 1870s, coupled with machine guns, made crossing open ground extremely difficult. Commanders on both sides failed to develop tactics for breaching entrenched positions without heavy casualties. In time, however, technology began to produce new offensive weapons, such as gas warfare and the tank. Just after the First Battle of the Marne (5–12 September 1914), both Entente and German forces each continually sought to outflank the other by manoeuvering to the north: this series of manoeuvres became known as the "Race to the Sea". When these outflanking efforts failed, Britain and France soon found themselves facing an uninterrupted line of entrenched German forces from Lorraine to Belgium's coast. Britain and France sought to take the offensive, while Germany defended the occupied territories. Consequently, German trenches were much better constructed than those of their enemy; Anglo-French trenches were only intended to be "temporary" before their forces broke through German defences. Both sides tried to break the stalemate using scientific and technological advances. On 22 April 1915, at the Second Battle of Ypres, the Germans (violating the Hague Convention) used chlorine gas for the first time on the Western Front. Several types of gas soon became widely used by both sides, and though it never proved a decisive, battle-winning weapon, poison gas became one of the most-feared and best-remembered horrors of the war. Tanks were first used in combat by the British during the Battle of Flers-Courcelette (part of the wider Somme offensive) on 15 September 1916, with only partial success. However, their effectiveness would grow as the war progressed; the Germans employed only very small numbers of their own design, supplemented by captured Allied tanks.