In 1941 the London Czechoslovak emigration led by Edvard Benes came to conviction that it is necessary to resettle the German and Hungarian population from the post-war renewed Czechoslovakia and the country borders have to be changed to ethnic borders. The population exchange that began in 1947 - with longer or shorter interruptions - lasted to December 1948. 89 660 Hungarians were resettled from Czechoslovakia, and settled voluntarily or forcefully in Hungary. In the contrary to the exchange transports and regime transports, and on the basis of the decision No. 48 and 60 of the Czechoslovak-Hungarian Joint Committee that was in charge of the population exchange, a total of 71 787 Slovaks arrived from Hungary to Czechoslovakia. Therefore, the population exchange was not executed in the extension planned by Czechoslovakia - it did not succeed to settle the 'war criminals' as it was planned and also the settlement of almost fifteen percent of Hungarians living in Slovakia in the most concerned regions (mainly in the regions by the river of Hron and Vah, in Upper Zitny ostrov, Komarno and Nove Zamky, in a smaller extension in Gemer), but it still resulted to extensive change of the ethnical compositions in previous homogenous Hungarian territories.