Definition of "scully"

Horned scullies usually are placed in water about 15 feet apart in a line parallel to the beach, with the rails pointing out to sea

1962, Demolition Materials‎

Draw in both man-made and natural obstacles. Anything that may hinder the proposed landing (e.g., cusps, submerged rocks, partially awash or submerged wrecks, scullies, berm scarps, sandbars, rails, etc.) may be considered an obstacle.

1974, US Navy SEAL Combat Manual‎

Experiments were carried out with placed charges to breach antitank walls, destroy concrete tubes or horned scullies, and fill anti-tank ditches

2008, Stephen Sussna, Defeat and Triumph: The Story of a Controversial Allied Invasion and French Rebirth‎