Skaak

Skaak was a Sontaran Commander in charge of the fleet involved during the time invasion of the Crimean War.

Biography
After Ritskaw led the attack on Earth during the events of the Flux, (TV: The Halloween Apocalypse), Skaak led the charge against the British Army in the Crimean War. He chose the Crimea both because he believed it to be the most appropriate starting point, and because he wanted to ride a horse. After the Thirteenth Doctor drained the supplies of the Sontarans, they were forced to retreat. As they

were doing so, Skaak and his army were all killed when their ships were blown up by General Logan. (TV: War of the Sontarans)