Militaries across the land rely on lines of pikemen carrying both their long spears and a shield. You are familiar with this fighting style.
Prerequisites
Base attack bonus +1.
Benefit
You can wield a normally two-handed polearm or spear in one hand, provided you are wielding a light or heavy shield in your other hand. When wielding a weapon in this manner, you treat it in all ways as being a one-handed weapon, rather than a weapon of its normal handedness.