AA guns soon proved to be effective against ground forces as well.  Paul Nagy states to have disabled this Soviet light tank with his Bofors AA gun.

Disabled Soviet T-26 Tank by Magyar

Hungarian soldiers wait for their turn to belly up to a communal "goulash cannon" -- probably for a bowl of soup, accompanied by a thick slice of bread.

Honved Field-Kitchen, Russian Front

The gun is most likely a Swedish-designed Bofors 80 mm anti-aircraft gun, manufactured in Hungary by MAVAG, all set up for action somewhere in western Russia. The unit's ammunition itself had been hauled there by Paul Nagy in a sizeable military truck, as he describes in his autobiography published recently.