Battle of the Somme

The Battle of the Somme took place in either 1914 (NA: Death and Diplomacy) or 1917, during World War I. John Jarrow and Roger Gleave both fought and Jarrow was killed.

Fitz Kreiner tried to stir memories of the battle within Gleave, after he was taken as a host by wasps affected by an alien device. (EDA: Eater of Wasps)

"Do you remember what the Somme looked like afterwards? All churned‐up mud, without a single tree or building left standing? Blasted and blasted until there was nothing but… well, desolation."

- Fitz Kreiner

Behind the scenes
In reality, the battle took place in 1916. However, within the Doctor Who universe, the date is disputed with the sources contradicting one another without either being correct.