[1] Assigned to Operational Group "Śląsk" (Polish for Silesia), the Groźny saw service against the 3rd Infantry Division near Orzesze on the morning of 1 September 1939.
The train's assault platoon was used in an attack on a road to Żwaków which failed due to machine gun and mortar fire.
[1] On 4 September 1939 with the front collapsing, the train protected the right flank of the retreating Operational Group "Śląsk" (Now "Jagmin"), taking artillery fire, damaging the tender and injuring Captain Kulesza.
[1] On 5 September 1939, the train's tankettes on a reconnaissance mission drove off a German motorized pioneer patrol of the 27th Division that was trying to destroy track near Wolbrom.
Explosives were used to damage the train and removed the machine guns and gun breeches with the crew later linking up with either Strzelec Kresowy (PP 51) or Operational Group "Polesie"[1][2] Its two artillery wagons were split up and formed part of the Panzerzug 21 and Panzerzug 22 with a 100mm howitzer & 75mm cannon and two 75mm cannons respectively.