to cross and had been fortified. Beaucourt Ridge further back, gave a commanding view to German artillery observers, who could see the gun flashes of British field artillery, despite the guns being dug in. British observers could not see beyond the German support trenches and the convex slope on the British side of no man's land, making it difficult for heavy artillery to hit the front position, parts of which were untouched by the preliminary bombardment. As signs of an Allied offensive increased during 1916, the lessons of the Second Battle of Artois and the Battle of Hébuterne in 1915, were incorporated into the defences of the Somme front. Observation posts were built in each defence sector, more barbed wire was laid and more telephone interception stations were installed, at the same time that more emphasis was laid on German telephone security. In early March and from the chief engineer of the 2nd Army inspected the first position in the area of the 26th Reserve Division; only in the area of RIR 119 at Beaumont-Hamel and the trenches to the west around Hawthorn Ridge Redoubt, were there enough shell-proof concrete posts. German infantry made a great effort to gather intelligence, patrol and raid the British lines to snatch prisoners; the British became more experienced in responding to local attacks and began to use the same tactics. In May, Soden wrote that at least of artillery ammunition were necessary, to ensure the success of a raid. On the night of a raiding party of RIR 119 failed to get forward when the German artillery fired short. British preparations Special arrangements were made by the 29th Division to capture Hawthorn Ridge Redoubt. Three tunnels were dug under no man's land by tunnellers of the Royal Engineers. The first tunnel was to be a communication link to the Sunken Lane (shown in the film The Battle of the Somme, released in August 1916). British units had just moved into the Sunken Lane and the tunnel constructed by 252nd Tunnelling Company served to link it with the old British front line. In the early hours of 1 July, the 1st Battalion, The Lancashire Fusiliers were to use it to reach the Sunken Lane, ready to attack Beaumont-Hamel. Two other tunnels, First Avenue and Mary, named after the communications trenches leading into them, were Russian saps dug to within of the German front line, ready