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In anticipation of CoG:EE I started playing the old CoG again and ran into the following situation: as Spain, I attacked Portugal's 2 provinces: Lisbon and Elvas. When I had hammered the Portugese, the Prussians stepped in to help them. Nevertheless, Lisbon surrendered to me after a siege and is now a province of mine. I besieged Elvas, too, and won that siege as well: it did not surrender to me, however, since it is (I think) part of Prussia now! Is there any way to get this province other than by forcing Prussia to surrender to me and demanding the province?

Thanks for any help.