the Germans discovered very early in there invasion of Russia that Flak guns where very useful against waives of Russian infantry there are pictures of Flak 37 being used in the anti infantry roll I think there is even film one thing you will notice is the crew lying on the ground firing the weapon through the foot controls using tracer to aim the weapon this was very devastating against infantry and lightly armored vehicles to get these weapons into action quickly the next stage was to mount them on trucks but these were lightly armored and easily lost various units used whatever tank that was capable of carrying Flak guns T34, and Panther was adapted along with Sherman and anything else that fell into German hands once on a tank they were very mobile well armored and devastating against anything other than tanks, the Halb pocket was south of Berlin it was a moving pocket as opposed to the usual static type the Germans used adapted flak tanks along with westwind, whirlwind and 38T variants called Gepard predominantly against Russian infantry, in 5 days of fighting the Germans lost an estimated 50-80000 infantry and 10000 plus civilians, to those in the know this is nothing new.

The Bergpanther D with PzIV turret has been covered various times on this forum before, again nothing new