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Alternative Universe: Protecting soldiers from the combustible lemons
Quick briefing:
Era: After ww2, before cold war
Hitler had come back from the Meme Hell.
He brought his army too.
He wants to capture an alien to steal his technology.
The alien doesn't want this to happen, so it decides to help the Polish cavalry from the shadows by giving them Cave Johnson's legendary Combustible Lemons, so they stand a chance against the Tiger II tanks.
This was all, the alien could do to help, the rest is on the cavalry.