Mobile Bulwark Style (Combat, Style)Source Armor Master's Handbook pg. 12
You are able to swing your tower shield around quickly.
Prerequisites: Str 13, Shield Focus, Tower Shield Proficiency, base attack bonus +1.
Benefit: While using a tower shield, add the shield’s bonus to AC (including its enhancement bonus) to your CMD against bull rush and overrun combat maneuvers. While using this style, you can use a tower shield to grant you total cover along one edge of your space (Pathfinder Roleplaying Game Core Rulebook 153) as a move action.