I've always thought his military exploits have managed to overshadow many his greater achievements. He managed to reform Prussia and give it highly efficient bureaucracy, revolutionized the economy and introuduced many enlightenment principles into the country.
Russia's withdrawal from the 7YW does not lessen his sucess at all. He managed to last against three major powers of Europe for seven years with little aid. No matter the outcome, the amount of time he lasted is a vestment to his skill.
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