The year is 1011 and New Mareland has been self declared independent from Equestria for a few years now. With that, they have now evaded all responsibility that would have come with being a colony of Equestria's when it came to the war, that is until Equestria sends in a request for old supplies they left behind during the split.

The supplies are cleared through the New Mareland government and are sent off to Equestria, or they would until the ship carrying it explodes in the harbor of New Manehatten, causing the biggest, accidental, creature made explosion ever.

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This story takes place in the Equestria at War Universe, which takes place in a mod for Hearts of Iron 4.

Here's their FimFiction group: https://www.fimfiction.net/group/212917/equestria-at-war