Florence Nightingale was a nurse in Crimean war in 1954 there to help the British but she was actually a Russian spy working against Britain for the Russians.
When the British Soldiers where injured and came to her she would inject them with poison so they would die and more and more Soldiers would be killed so the Russians would have a better chance at winning the war.
The Soldiers had no clue what Florance was doing, but more and more Soldiers were dying and they were losing the war.
Florance would tell the Russian Soldiers what was going on and the would take and use that to their advantage so that she can create a diversion.
One night Florance was with a soldier and he caught on to her and yelled for help but, it was to late he died 10 minutes after and Florance kept doing what she was song and founded an organization called the green cross.
Eventually she got caught and she got thrown in jail for the rest of her life but, she had more people working in the green cross it is still a thing today.