With the battle generator you can make whatever you want. I tried it last night, and put up a massive infanterybattle over some hills. I of course had Blenheims and arty as well as my British chaps.
Ze Germans were crushed, hehe.
PS: In tank battles a tank with elite crew can cause havoc, as they are able to fire on the move (and hit), while inexperienced crew have to stop the tank to fire (and miss). This is why it is very nice to have some crewd with you all the way.