The first British sharpshooters on the Western Front relied solely on their iron sights, with tubular scopes not coming to prominence in the British Army until the penultimate year of the war. But, inroads were made towards giving sharpshooters magnified optics to improve marksmanship. The Lattey, and several other similar 'clip-on' sights were officially adopted by the British Army in 1915, but as Jonathan explains, they didn't cause much of a spectacle.