Fighter Attack 1Cleave
You hit one enemy, then cleave into another.
At-Will Martial, Weapon
Standard Action Melee weapon
Targets: One creature
Attack: Strength vs. AC
Hit: 1[W] + Strength modifier damage, and an enemy adjacent to you other than the target takes damage equal to your Strength modifier.
Level 21: 2[W] + Strength modifier damage.
Published in Player's Handbook, page(s) 77, Class Compendium.