Local consequences of the Trianon Peace Treaty have not been researched thoroughly. This study describes the everyday life of rural people on both sides of the Eastern part of the new border between Hungary and Czechoslovakia. Based on research in Hungarian and Czech archives and with the help of newspaper articles, the author illustrates the difficulties of re-establishing the old familial and economic ties between villages that were separated by the border. Many activities of the borderland people were illegal. The paper discusses how authorities responded to these offences. Besides long and small distance traffic and the problems of dual landowners, illegal crossing, contraband, and border incidents are also part of the analysis. Contrary to all hardships, the border remained permeable in the interwar period.