Aggressive factions are unrealistic

[QuintusSertorius]

I'm kind of more concerned about how unrealistic siege warfare is (thanks to the R:TW engine). In antiquity, most sieges went one of four ways: surrender before the first parallel was even dug or engine sited; treachery leading to the garrison being betrayed (and a large sum of silver changing hands); surrender because of starvation after a long blockade; or an accomdation reached between besiegers and defenders, with the former moving on and leaving the place unmolested. The number of sieges won by assault were extremely rare, because a properly sited fortification was just too costly to attack.