Martini Henry is a Codex Entry featured in Battlefield 1. It is unlocked upon obtaining 10 kills with the Martini-Henry.
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Although production of the Martini Henry Rifle ended in 1889, it remained in service throughout the British Empire until the end of WW1 - but was even seen in use in Afghanistan well into the 21st century. It was a breech-loading, single-shot weapon firing a heavy black powder cartridge which caused horrific damage.
In WW1, the Martini Henry was primarily fielded as a reserve rifle, but in the earlier stages of the war it was used in aircrafts as an anti-balloon weapon together with newly developed incendiary ammunition. The Martini Henry was also issued to colonial troops in the African and Middle-Eastern theaters of WW1.