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So what if the Knights win at Tannenberg rolleyes, and the Lithuanian King Vytautas is killed in the battle.
I read that parts of Lithuania (including Samogitia) were not Christianized until after the Battle, and I think Vytautas was an important figure in the whole Christianization process.
So what if, after a defeat at Tannenberg and thus in the Polish-Lithuanian-Teutonic War, the Lithuanians (who only adopted Christianity decades earlier) reject Christianity, which led to their defeat, and return to their old pagan beliefs?