The Polish army had about 500 tanks of various types. Their capabilities of firepower, mobility and armored protection ranged from very good to totally obsolescent. The tactical doctrine of the army stressed the importance of maneuver, concentration of force and economy of effort. In 1939, however, the lengthy process of converting the horse-mounted cavalry into armored units was just beginning. In addition, despite the undoubted bravery, élan, and high training standards of many tank crewmen and junior commanders, some of their senior commanders still held the outdated belief that tanks were merely fire support for the infantry, rather than the leading edge of aggressive advances.
