How do you pronounce the Polish word Rzeczpospolita?

I'm currently researching a Polish army from the period 1576-1631, which is known at the Rzeczpospolita, or "Commonwealth" in English. The idea is that I shall construct a wargames army of this ilk. however I feel that it would be a tad embarassing to have an army the name of which I can't pronounce, so would welcome pronunciation from any Polish speakers out there. Ta.