- Mar 11 Sir James Outram, 1st Baronet, English general (b. 1803)
- Mar 17 John Pelham, U.S. Confederate artillery major, dies in battle at 24
- Mar 21 Edwin Vose Sumner, US Union-general-major (Fair Oaks), dies at 66
- Mar 28 James Cooper, US attorney/senator/Union-brigadier general, dies at 52
Assassination
Car Crash
Hanging
Killed in Action
Plane Crash
Poisoning