Pack Tactics
(Dragon Compendium, page , DnD 3.5)
[General, Fighter Bonus Feat]
Fighting in cooperation with one or more partners is second nature to you. You are a master of harrying opponents and finding their undefended flanks.
Prerequisite
WIS 13
Benefit
Whenever you flank an opponent, an ally not flanking that foe gains a +1 bonus on melee attacks made against your flanked opponent. Flanking allies retain the normal +2 bonus on melee attacks.
Special
A fighter may select Pack Tactics as one of his fighter bonus feats.