The Honourable Artillery Company, the oldest surviving regiment in the British Army, and the second most senior, is formed.

Sepoy Mangal Pandey of the 34th Regiment, Bengal Native Infantry revolts against the British rule in India and inspires a long-drawn War of Independence of 1857 also known as the Sepoy Mutiny.

American Civil War: Colonel Emory Upton leads a 10-regiment "Attack-in-depth" assault against the Confederate works at The Battle of Spotsylvania, which, though ultimately unsuccessful, would provide the idea for the massive assault against the Bloody Angle on May 12. Upton is slightly wounded but is immediately promoted to Brigadier general.