After the outbreak of the Polish Defensive War the division entered in contact with the enemy on the first hours of the conflict.

After the outbreak of the Polish Defensive War of 1939 it was attacked on September 2.

During the Polish Defensive War of 1939 all C7P were used in active service.

He fought in the Polish Defensive War as a commander of an improvised infantry unit.

He took part in the Polish Defensive War of 1939 and fought with distinction in a number of battles.

The construction of the first prototype was stopped by the outbreak of the Polish Defensive War.

Majchrowski fought in the Polish Defensive War of 1939.

Took part in the Polish Defensive War in 1939.

After the Polish Defensive War of 1939 Paderewski returned to public life.

When the Polish Defensive War finally broke out on 1 September 1939, this proved to be a fatal move.