Crimean War (War of the Sontarans)
From Tardis Wiki, the free Doctor Who reference
In an alternate timeline, the Crimean War was fought between Sontar and the British. With the help of the Thirteenth Doctor, the war ended in 1855 when the Sontarans - in the midst of a strategic withdrawal - were defeated by British troops of the Light Division under the command of Lieutenant General Logan. (TV: War of the Sontarans)
As with the original version of the war, (AUDIO: The Charge of the Night Brigade) Mary Seacole was present in Crimea where she helped troops on both sides at her British Hotel. (TV: War of the Sontarans)