flies above in "the perch" position. The defender will then attempt to lure their opponents into a good position to be attacked by the wingman. Defensive split A pair of fighters encountering one or two attackers will often use a defensive split. The maneuver consists of both defenders making turns in opposite directions, forcing the attackers to follow only one aircraft. This allows the other defender to circle around, and maneuver behind the attackers. Sandwich A sandwich maneuver begins with two defenders flying line-abreast, with typically about a mile of lateral separation. When an attacker maneuvers onto the tail of one aircraft, the defender will make a sharp turn away from the wingman. At the same time, the wingman turns in the same direction as the defender. When both fighters turn 90 degrees, they will come into single-file alignment with each other, "sandwiching" the attacker in the middle. Because the attacker is distracted chasing the defender, this allows the wingman to maneuver onto the attacker's tail for an easy shot. Break Spotting an attacker approaching from behind, the defender will usually break. The maneuver consists of turning sharply across the attacker's flight path, to increase AOT (angle off tail). The defender is exposed to the attacker's guns for only a brief instant (snapshot). The maneuver works well because the slower moving defender has a smaller turn radius and bigger angular velocity, and a target with a high crossing speed (where the bearing to the target is changing rapidly) is very difficult to shoot. This can also help to force the attacker to overshoot, which may not be true had the turn been made away from the attacker's flight path. Barrel roll attack The counter to a break is often a displacement roll called a barrel roll attack. A barrel roll consists of performing a roll and a loop, completing both at the same time. The result is a helical roll around a straight flight path. The barrel roll attack uses a much tighter loop than the roll, completing a full loop while only executing 3/4 of a roll. The result is a virtual 90 degree turn, using all three dimensions, in the direction opposite of the roll. Rolling away from the defender's break, the attacker completes the roll with the aircraft's nose pointed in the direction of the defender's travel. High-side guns pass If the attacker has a significant altitude