artillery attack on a 2 inf on a 1. If you have an artillery and a inf both attacking the inf gets boosted to 2. 1 arty can only boost 1 inf
Inf and arty defend at 2 by themselves. Inf are cheaper. You need inf for defense as well as for the attack bonus. You also need inf for cannon fodder and blockers.
Once you get some arty just buy inf to replace your losses and try and maintain a 1:1 ratio. If on defense you probably want more of a 2:1 or even 3:1 ratio. Depends on your situation. If you’re really under pressure a lot of people will go all inf for max defense.
I’ve always liked to be able to do small counterattacks when possible though. It’s nice to have a couple planes so you can at least do some minor counterattacks.
Best thing is to set it up and give it a go : )
you might want to read through the after action reports a couple threads above you. probably some good info there for ya