Leeb?

I keep three artillery generals (Konev, Zhukov, Govorov), but I rarely use Govorov. Artillery generals need to be paired with heavy tanks, and preferably a tank general in conquests because of their fragility. Artillery can weaken tanks and city fortifications, allowing a tank general to finish the threat. Infantry can do the actual taking of the city once it is cleared. Their mobility and cheap price means you can keep them hanging just behind your tank general out of enemy range until they are needed to slide into the open city.

What I generally do is save up for a stacked heavy tank for top tank general, then build stacked artillery for top artillery general. Then tank, then artillery. I pair a tank and artillery general and send the two teams toward different objectives. By the time I’m getting tank generals 3 and 4 built, I’m usually sending them towards other theaters like Africa or to reinforce my original attacking pairs. By that time, you have usually taken enough cities that you can build supporting heavy units to send with tank generals 3 and 4. I’ll usually use a fifth tank general before a third artillery general, and the last spot goes to Dönitz to clear out enemy naval units. You can use a fourth or fifth tank general to help defend in the east with the Soviets or British or French in a lighter tank and save your better tank generals for when you can build heavy units. An artillery general will be quickly overwhelmed trying to defend against attacks like that. They just don’t have the durability.