In June 2015, field work related to non-invasive prospection were carried out at the archaeological site of the Medieval stronghold in Czerchów (Ozorków commune, Zgierz district, Łódź voivodeship). The study area covered the mostly levelled earthwork and its immediate surroundings. Non-invasive prospection was aimed at recognizing the site with geophysical methods in order to indicate the places of occurrence of archaeological sources.