alternatehistory.com

In one of the more bizzare beginnings and conclusions of a war, the small country of Paraguay once declared war on all of its surrounding neighbours: Argentina, Uruguay, and Brazil. The country was completely decimated in the quick onslaught of foreign armies.

The challenge is that Paraguay is successful in this endeavor. Either by going against each country separately similar to Prussia's approach (Austria-Denmark-France), or due to sheer military genius, Paraguay must successfully defend itself against its foreign neighbours and take some of their territories.

For reference here is a map of Paraguay and the neighbouring region:
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