A column of armored vehicles of the 1st Ukrainian Front is moving along the road on the outskirts of Berlin. In the column are  ISU-152 self-propelled guns and T-34-85 tanks;  April, 1945.

Armored vehicles with firepower

Battery of 152-mm ML-20 howitzer-guns of the 1st Belorussian Front in position on the outskirts of Berlin; April, 1945.

Heavy artillery pieces

Red Army soldiers on the march with horse-drawn 76-mm ZiS-3 divisional cannons. Presumably, the picture was taken during the Balaton operation in Hungary; March 1945.
The ZiS was a factory designation, that stood for "Zavod Imeni Stalina" (Plant named after Stalin), the honorific title of Artillery Factory No. 92, which first constructed this gun.