Fearless rescue
warlord attack 1
Melee weapon
Trigger: an enemy within 5 squares of this power's user reduces an ally to 0 or fewer hit points
Target: the triggering enemy
Attack: Strength + 1 vs. AC
Hit: "2[W] + Strength modifier damage."
Effect: "Before the attack, you can move to the nearest square from which you can attack the target.
"The ally can spend a healing surge and regains an additional 1d6 hit points for every opportunity attack you provoke while moving to the target."[MP:104]
Fearless rescue is a daily power available to warlords at 1st level.