Shield Wall
( Heroes of Battle, p. 99)[Fighter Bonus Feat, General]
You are skilled in using shields when in formation with other shield-bearers.
Prerequisite
Shielf Proficiency (PH) ,
Benefit
When you and an adjacent ally are each using a shield, your shield bonus to Armor Class increases by 2.
Special
A fighter can select Shield Wall as one of his fighter bonus feats (see page 38 of the Player's Handbook).