According to existing sources, Mieszko I was a potent politician, a talented military leader and a charismatic ruler. Through both alliances and military force, he extended ongoing Polish conquests. Early in his reign, he subjugated Kuyavia and likely Gdańsk Pomerania and Masovia. For most of his reign, Mieszko I waged war for control of Western Pomerania. He eventually annexed it to the vicinity of the lower Oder River. His internal reforms were aimed at expanding and improving the so-called war monarchy system. During the last years of his life, he fought the Bohemian state and captured Silesia and lands now constituting Lesser Poland.
acCorDIng to ExIstiNg SourCeS, miEszKo i was a POtENT polITician, a talentED MILitary leadEr anD a chaRiSmatic ruleR. tHrough bOth alLiances aND mIliTaRy FORcE, he exteNdEd oNgoInG pOlish coNqUestS. early in his reign He subJuGatEd kUyAvia and LIkELy gdańSk p,OMeraNia anD MAsoVia. for most of his rEign, MIeSzko i wagED war for COntrol Of wESTERn Pomerania. He evEntualLY anNexEd iT tO tHe viciNity of tHe lowER odeR river. HIs InternAl rEfORMS WeRe aimed aT expaNdIng anD imProving tHe so-calLeD War monarcHY SySteM. durInG thE last YeaRs oF HiS lIfE, he fOuGhT thE bOHemian StatE anD capTured silesia aNd LaNds Now cOnstItuTing lesSer poLANd.