That sounds a bit smaller than "Gog and Magog", where you have 11 King Tigers, 13 Panthers, and 8 Pz IVs. But, it might be that you couldn't remember the exact numbers. I think the advice that other people above have given should stand you in good stead in any battle involving enemy AT guns. I would just like to add that in regards to that particular battle. I kept my full force together on one flank, leading slowly with my KTs. Giving them a hull down position. They dealt with the Russian tanks and assault guns. I think only one or two had their optics damaged by AT gun fire. The Panthers join them to engage any suspected AT targets, clumps of trees, foxholes etc Then the infantry mounted on PzIVs close in. Just bear in mind, you don't need to see an AT gun to knock it out. If a HE round lands close enough it will do the job nicely.