And this new, menu mana doesn't count. I mean the kind you saw on the battlefield which use depleted when you spawned fighters and when you used spells
How can you even call this an epic war game? The two characterizing attributes of epic war were the arrow gun, and the mana which forced you to CHOOSE which units to use. What's this autospawn crap? It's not just that the strategy has changed, the GAME MECHANICS ARE FUNDAMENTALLY DIFFERENT! This isn't a sequel, it's a knock off.
For B2, you need to do trial and error. Just try different switches until you find the two that correspond to the two red pieces that are blocking the port (on the right side) from hitting the target.