Dee ihe na-aga n'ihu maka paragraf a - Na ngwụcha Agha Worldwa nke Abụọ ndị Red Army weghaara obodo ahụ n'oge Ọgụ East Prussian wee tufuo ihe fọrọ nke nta ka ọ bụrụ 20% nke ụlọ ya. Ndị Germany fọdụrụ mgbe a chụpụsịrị ha
A chụpụrụ ọtụtụ n'ime ha mgbe agha biri ma were ndị Poland dochie ha. Site na 1945 ruo 1947 a maara obodo ahụ site na aha Polish akụkọ ihe mere eme "Ządzbork". A gbanwere aha obodo ahụ ka ọ bụrụ "Mrągowo" ugbu a na 1947, na nsọpụrụ nke pastọ Polish, onye edemede na onye ntụgharị okwu Krzysztof Celestyn Mrongovius (1764<unk>1855), onye ama ama na-agbachitere asụsụ Polish na Masuria.