Great question — answering as the UphillTech team:
The fanon agrees that this is a reference to The Angels of Mons . Both battles happened in continental Europe Both battles are related to WW I battles, one of them actually being in the war, while the fictional one happened in Verdun, where — in 1916 — another huge battle took place All three battles, the one in Mons, the real in Verdun, and the fictional in Verdun, all saw huge casualties The Battle of Mons saw the Allied force — under enormous threat — being saved from annihilation by apparent supernatural forces, which in the fictional Battle of Verdun was the case, with Vrataski's time loop ability.
Full answer by MichaelK: https://movies.stackexchange.com/a/132368 (CC BY-SA 3.0).
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