February 19 0197

Lucius Septimius Severus' Arm Beats Clodius Albinus Lyon 

The Battle of Lugdunum, also called the battle of Lyon, was fought on 19 February 0197 at Lugdunum (Modern Lyon, France), between the armies of the Roman Emperor Septimius Severus and the Roman usurper Clodius Albinus. Severus' victory finally established him as the sole Emperor of the Roman Empire.
This battle is said to be the largest, most hard fought and bloodiest of all clashes between Roman forces. The historian Cassius Dio places the number involved as 300,000 or 150,000 on either side of the battle. This figure has been disputed, as this is approximately three-quarters of the total number of soldiers present throughout the Roman Empire at that time. However, it is widely accepted that the total number of soldiers and support personnel involved exceeded 100,000 and could well have come close to the 150,000 figure Dio gives.