 The whole matter is complicated by the fact that there was a high percentage of bilingual and similarly "Slovak-Hungarian" persons who could claim being both Slovak and Hungarian.Slovak sources usually do not deny that many Hungarian teachers (replaced in Slovak schools by Slovak and Czech teachers), railwaymen (on strike against new Czechoslovak republic in February 1919), postmen, policemen, soldiers and civil clerks (replaced by Czech and Slovak soldiers, policemen and clerks) were forced to leave or left for Hungary voluntarily, the numbers however are unclear but census do show a rapid decline in the number of people with Hungarian as a mother tongue.Some teachers and civil servants were expelled from Czechoslovakia while some left due to the harsh circumstances.