Peterloo
In 1819, the 15th played a pivotal role in the notorious Peterloo Massacre, where a 60,000 strong crowd calling for democratic reform were charged by the Yeomanry. Panic from the crowd was interpreted as an attack on the Yeomanry and the Hussars (led by Lieutenant Colonel Guy L'Estrange) were ordered in. The charge resulted in 15 fatalities and as many as 600 injured.
The title was simplified in 1861 to the 15th (The King's) Hussars.
Read more about this topic: 15th The King's Hussars