Expert Siege Engineer( Heroes of Battle, p. 97)
You are particularly skilled at operating siege weapons, such as catapults and battering rams.
Profession (siege engineer) 8 ranks,
You gain a +2 competence bonus on attack rolls and damage rolls made when using a siege engine. (Chapter 4 has rules for operating siege engines.) SPECIAL: A fighter can select Expert Siege Engineer as one of his fighter bonus feats (see page 38 of the Player's Handbook).