Just found this; milsch may be this town in present day Poland, Milcz; everything about the town seems to fit the parameters found thus far and it was under German dominion at one time; the search for the variant spelling was inspired by something my second ex, a German, told me about her mother's birthplace which had two names, one in Polish and a variant in German...
https://en.wikipedia.org/wiki/Milcz
Coordinates: 53°2′35″N 16°51′35″E
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