Trench warfare
Trench warfare prevailed on the Western Front from late 1914 until the Germans launched their Spring Offensive on 21 March 1918. After the buildup of forces in 1915, the Western Front became a stalemated struggle between equals, to be decided by attrition. Frontal assaults, and their associated casualties, became inevitable because the continuous trench lines had no open flanks. Casualties of the defenders matched those of the attackers, as vast reserves were expended in costly counter-attacks or exposed to the attacker's massed artillery. There were periods in which rigid trench warfare broke down, such as during the Battle of the Somme, but the lines never moved very far. The war would be won by the side that was able to commit the last reserves to the Western Front.
92nd Brigade (United Kingdom)
The brigade was first introduced to trench warfare on 21 March by groups being attached to the 36th (Ulster) Division in the line. On 28 March the 10th and 11th Bns relieved Ulster battalions in front of Beaumont-Hamel and Y Ravine, with 12th and 13th Bns in support. Although this was a quiet sector of the line, the battalions suffered their first casualties during this short tour, mainly from German "Minenwerfer"s (trench mortars). Shortly afterwards 31st Division formed its own light trench mortar batteries (TMBs), with the Hull Pals contributing men to 92/1 and 92/2 TMBs for 92 Bde. 10th Battalion also provided working parties to assist the 252nd Tunnelling Company, Royal Engineers, digging the Hawthorn Ridge mine that was to be exploded to launch the forthcoming Battle of the Somme. Over the next weeks the battalions took their turns in the routine of trench holding, working parties, patrolling and trench raiding, with a constant drain on manpower from shelling and snipers.