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 trenches. It did no damage at the time, but the R.E. Mining Officer, Lieutenant Barclay, in counter-mining towards the crater it had made, saw, through the wall of his mine, Germans engaged in turning the crater into an advanced-post. Trench-mortars were fired at once to discourage them. Then came reports of underground workings heard in other directions and, notably, close to the parapet of a trench near the White House. This was on the evening of the 24th. Hardly had orders been given to clear the White House trench, when the ground at the junction of Lieutenant Barclay's countermine and the German crater went up and the Lieutenant was killed. At the same time an explosion occurred near the White House. Two privates of the Irish Guards (2845 J. Mansfield and 3975 M. Brine) volunteered to enter our mine and see what had happened. They recovered Lieutenant Barclay's body at great risk from the asphyxiating gases, and both men were recommended for the D.C.M. The explosion near the White House was, after inspection, put down as the work of a heavy shell, not a mine; but listening parties reported more underground noises and another section of trench was evacuated accordingly. To prevent the Germans consolidating themselves further in the crater which connected with Lieutenant Barclay's mine, our 4.5 howitzers bombarded it on the 25th, and it was decided to blow our end of the mine as soon as possible to prevent the enemy working up it. This was difficult, for the galleries were full of foul gas—whether leaking from some adjacent coal-pit or laid on by the enemy was uncertain. The R.E. officer who went down to lay the charges was asphyxiated and several of his men were injured.

Not till the 29th of April were the difficulties overcome; by which time the enemy had driven a fresh shaft into it. After the explosion, a field battery (17th R.F.A.) and the 47th Howitzer Battery fired a salvo at the German trenches. "There was a little rifle-fire, but soon all was quiet." Mining, like aerial and bombing work, was still in its infancy, and the information