The 10th Panzer Division was first formed on 1 April 1939 in Prague, as a composite formation made-up of previously established units throughout Germany. Many of these units were transferred from the 20th Motorized Division, the 29th Motorized Division, and the 3rd Light Division. By the fall of 1939, the division was still forming, but was nonetheless committed to the 1939 Invasion of Poland before the process was complete.