You might like to know...
Rollinglogs, rockfalls, abatis, and traps do not attack siege weapons..so, for instance, if you attack with JUST ballistas and transports, the only defense that attacks you is the Archer towers...which, as it happens, can't reach you depending on the level of your archery vs the defenders..
of course, you could still lose to open gates, but thats another discussion.
Questions about troop numbers
Thanks for this guide. I have noticed several threads where people seem annoyed that people ask this. They say, "Search the threads, you stupid noobs!" But I have failed to find a search function in this forum yet. Maybe the forum software has changed or I'm looking in the wrong place, but I find the lack of a search function to be the biggest problem with finding anything helpful in these forums.