Soviet officers with their prize trophy, a captured operational German Pz.Kpfw. IV. tank.

 Pz.Kpfw. IV.

Soviet IS-2 (Josef Stalin) heavy tank.

Could someone tell me what those containers are on the back of the tank?

The cylinders seem to be on both sides of the tank, what did they contain?

Thank you,

Soviet IS-2 (Josef Stalin) heavy tank

A Red Army officer and other Soviet soldiers in newly conquered Budapest amidst the damaged buildings. On the left is the blown-up Elizabeth bridge; Jan. 1945.