So it was when some mines were exploded under the German earthworks on the lower slopes of the Vimy Ridge, where the enemy had already blown several mines and taken possession of their craters. It was to gain those craters, and new ones to be made by our mine charges, that the 74th Brigade of the 25th Division, a body of Lancashire men, the 9th Loyal North Lancashires and the 11th Royal Fusiliers, with a company of Royal Engineers and some Welsh pioneers, were detailed for the perilous adventure of driving in the mine shafts, putting tremendous charges of high explosives in the sapheads, and rushing the German positions.