Belgian Gate

noun1

1. •
   (historical) A heavy steel fence, typically mounted on concrete rollers, used as a mobile antitank obstacle during World War II.

   • Omaha Beach was shielded by about 3,700 obstacles, including 450 ramps, 2,000 stakes, 1,050 Czech hedgehogs, and 200 Belgian Gates. These followed a standard pattern. — 2013