I must have missed the memo about a "default strategy". I was under the impression that there wasn't one, but if there was one, it would be Play the map. Even assuming renaissance troops are the "default" troop of choice, all gunpowder units get C1. What's the point in playing at a level when you can have Cavalry vs longbows? If you can do that consistantly at diety, my hat is off to you and your should probably find a harder game to play.