GEAR, or Gaer, an ancient camp in the S of Cornwall; ½ a mile N of Trelowarren, and 4¼ ESE of Helston. It has a circular outline; occupies about 14 acres; commands the Helston river; and is in a line with two smaller camps. A precipitate retreat from it to the coast was made by the leader of a local force during the rebellion; and is popularly called the Gear Rout. A bridge, in its neighbourhood, over a branch of the Helston river, above Mawgan, bears the name of Gear Bridge.

(John Marius Wilson, Imperial Gazetteer of England and Wales (1870-72))