With a snap series of commands, you keep your allies in formation and well defended as you assault your adversary.

Encounter   ✦     Martial, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. AC

Hit: 1[W] + Strength modifier damage.

Effect: Until the end of your next turn, allies gain both a +2 power bonus to AC and cannot be pulled, pushed, or slid while adjacent to you.

Published in Player's Handbook, page(s) 146, Class Compendium.