The appeal quickly spread all over the country, trumpeted by other newspapers and radio. Copies of several papers which published it have been preserved to this day; in some of them there are names and photographs of some of those who applied. The search for volunteers turned into a popular patriotic movement which lasted until the first day of World War II — September 1, 1939, the day the German invasion of Poland began. It is now difficult to estimate how many people volunteered; most probably there were as many as 4700 men and some 150 women (3000 names are documented, as the Polish Navy issued special IDs for volunteers, signed by Commodore Eugeniusz Poplawski). The first people took their oaths on June 29, 1939.