The present article is a source edition of the house chronicle of the Congregation of the Mission in Lvov from the years 1939-1946. The annalist, Fr. Stanisław Kałężny nearly with daily accuracy recorded events which took place at that time in Eastern Lesser Poland (Małopolska) and especially in Lvov. He paid attention mainly to the life of the local Vincentian monastic society, problems connected with building a parish church of St. Vincent de Paul as well as broadly understood policy of the Soviet and German occupants. He did not omit the problem of saving Jews by the Vincentian fathers during the German occupation of Lvov (1941-1944). The traumatic events connected with World War II are accompanied by extensive descriptions from the years 1945 and 1946, showing the life of local people, nuns and Roman Catholic clergy forced by the Soviets to leave the city and move to the newly forming Polish People’s Republic. Thanks to the document in question not only do we get to know the factual material in chronological order but we also have a unique opportunity to accompany the described persons, follow their personal life and history – both in the war and post-war period.