2nd Polish republic was established after WW1, so there was no Polish ground. The border was supposed to be Curzon line (exactly that line, that USSR took back in 1939), but the Poles were gunning for more, hence the 1919-1921 war.
If you consider Polish ground whatever was high mark of Polish-Lithuanian commonwealth, then good luck with that. It was empire building in the making, they overstretched and didn't make it. It is no Polish ground exactly in the same sense, that Balkan is not Turkish either.
If you consider Polish ground whatever was high mark of Polish-Lithuanian commonwealth, then good luck with that. It was empire building in the making, they overstretched and didn't make it. It is no Polish ground exactly in the same sense, that Balkan is not Turkish either.