Battleground banks and unit types
Hello! I am relatively new to the game and have a couple of questions related to battlegrounds in SF: Rise of Balur. I have been reading forum posts and from what I gather there is an under the hood player "BG bank" that needs to get fed resources equivalent to the most recent payout reward before another is earned. What I am confused about is if there are two BG banks, one for defensive and one for offensive or both types of battlegrounds share the same bank?
Another question I had is unit types, should I be sending certain unit types v.s Balurs units? for example if the BG has all Calvary should I send Calvary against them, or if the BG has all Beastry, should only send mostly Beastry units against them? or does unit type not matter but only total offensive or defensive power? Lastly, can 1000 offensive power kill 1000 defensive units and vice versa? how do those power numbers work in terms of wining or losing the BG.
Sorry for all the questions! any help would be much appreciated!