I tried, it's impossible ... it's a blind battle :(

If you send 1 rowdy, it shows you what troops and resources the other side has.

No! You have to attak with 1 rowdy to see the troops, but you see them only after the battle... so it's a blind battle! If you go to my last blog you'll see what I mean

You basically send the rowdy on a suicide mission. Yes, that mission is “blind” but after that you can decide whether to proceed with an actual attack.