I know: that tile is Hill 60 post-1917...
The mines were detonated at the start of the Battle of Messines (714 June 1917), creating 19 large craters. The joint explosion of the mines at Messines ranks among the largest non-nuclear explosions of all time. The evening before the attack, General Sir Charles Harington, Chief of Staff of the Second Army (General Sir Herbert Plumer), remarked to the press, "Gentlemen, we may not make history tomorrow, but we shall certainly change the geography".