I can't really tell if this a bug or not or if most people already know about this. I more or less discovered this by accident.
I was playing as egypt on the Grand Campaign on maximum difficutly. After taking Constantinople, the pope called a crusade on me. After many, many, many years and even more seige battles, I got pretty darn good at defending myself in such a situation. One thing I found by accident, while trying to use flaming cataputs to burn enemy rams....is that if I move 1 unit of catapults outside my gate at the beginning of the battle (i originally did this to get a clear shot to burn up rams and siege towers, sacrificing the unit in the process) and park it a few paces in front of my gate...enemy rams cannot get by. At all. The ramming unit will collide with the artillery and both crews will duke it out for a bit. My unit usually dies pretty quickly, but the ram cannot further advance past my abandoned machine. If i manage to burn all the seige towers...all they have left is their own artillery (which I sack quickly with mamluks or arab cavarly) and ladders....and we all know how well ladders actually work, especially by themselves against a huge city.
If the enemy has mulitple rams, they still cannot get by the traffic jam of abondoned wooden thingsbut they try, ususally getting the new ram burned in the process. I tried this in a few other situations later in the game, i used other artillery such as ballistas and it worked as well. Apparently, you can use rams to go after other sections of wall (i've only done this vs. small wooden castles, not sure if it works on stone walls). And of course, the enemy can go for one of your other gates, but the AI has never even tried anything like this.
Anyone else have any experience with such things? I'm sure this does nothing in MP vs. a real opponent.
Oh, and 1 important thing, leaving your own castle during a siege can sometimes backfire as your army leaves the gate open the whole time, letting the enemy in. I found that when i send cav and arty through the gate, don't leave any defending units anywhere near the gate, as this keeps it open. I wish you could control exactly when the gates open and shut.
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