Equestrian Maneuver is a Ranger utility power available at the 2nd level.
Equestrian Maneuver
Ranger Utility 2
You guide your horse through tight spaces to reach that enemy who thought he was safe.
Encounter ✦ beast, martial
Close burst 1
Prerequisite: You must have a horse beast companion
Target: You and your beast companion.
Effect: Until the end of your next turn, while you are mounted on your beast companion, squeezing does not cause you or your beast companion to take a –5 penalty on attack rolls, grant combat advantage, or move at half speed