What an attack bonus is?
That’s when a units causes more damage to another unit than it should. For example, Skirmishers have an attack bonus vs. archers, what means they cause not 2 damage (their attack) but more to archer units. Rams have a very low attack (in range of 2 to 4), but cause great damage to buildings. For exact numbers of attack bonuses, you should look up at www.mrfixitonline.com , but in the next issue I’ll perhaps post these here. Anyway, you can easily perform such a test in the Map Editor.