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Shielded assault
warlord attack 1

Requirement: using a shield

Target: one creature

Attack: Strength vs. AC

Hit: "2[W] + Strength modifier damage."

Effect: "Until the end of your next turn, you gain a +2 power bonus to AC, and your allies gain a +2 power bonus to AC while adjacent to you."[MP2:85]

Shielded assault is an encounter power available to warlords at 1st level.