Honestly, my backstory was that a Kafer recon ship spotted humans during the 1800s and called in the fleet, with news of finding the Aach*ah. The 'military' (aka everybody) builds up and begins their trek across the stars.
The arrive on the doorstep of the Twilight War, with those tiny Acch*ah now using chemical weapons/nuclear missiles/space flight, tanks, etc.
Which was basically copying Turtledove's Tosevite issue and the aliens from Out of the Dark.
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