The Polish army had approximately 300 TK-3 in September 1939. In 1939, the TK-3s were worn and exceeded. They were nevertheless used on the front line where their armaments and shielding left them little chance of success or even survival to its crew.

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TK-3 with 20 mm FK Gun. This type of conversion caused many problems to German Panzers I and II in 1939, in spite of a weak shielding.