The camp in Nisko did not last long. In the spring of 1940, it was closed down.
Some of the prisoners returned home, while others fled to the part of Poland occupied by the Soviet Union under an alliance treaty with Nazi Germany. Many faced arrest, accusations of espionage, and deportation to Soviet labor and concentration camps. Directly from the camps, they then enlisted in the emerging Czechoslovak Brigade and participated in the fights on the Eastern Front.
A photograph from Karel Borský's interview with the USC Shoah Foundation.