Hill fort: Did you mean...?

A map detailing the troop movements at the Battle of Fort Washington (16 November 1776). Made by Wikipedia user Oneam, 13 July 2013.

Map of Fort George and surrounding areas during the War of 1812, from The Pictorial Field Book of the War of 1812 by Benson Lossing.

Attack on the American garrison of Fort Washington by the British and Hessians, 16 November 1776. Watercolor by Thomas Davies, 1776. New York Public Library.

Vindolanda was one of the Stanegate forts that pre-dated Hadrian's Wall. Constructed in about 85 CE and occupied until the end of Roman Britain, Vindolanda was the longest-occupied fort on the line of the Wall.

A print depicting Ethan Allen demanding the surrender of Fort Ticonderoga, 10 May 1775. By John Steeple Davis, 1875. Originally published in The Aldine: the Art Journal of America. (New York: The Aldine Co., 1868-1879) New York Public Library...

The Aalen Roman Fort was a Roman military camp on the Upper Germanic-Rhaetian Limes, a World Heritage Site in Germany. It was built in the 2nd century CE and was the largest cavalry garrison north of the Alps. The garrison was home to 1,000...

Fort Ticonderoga, Ticonderoga, New York, USA. Photo by Peretz Partensky, 2012.

The north gate of Housesteads Roman Fort (Vercovicium) and the line of Hadrian's Wall reaching eastwards across the Knag Burn Gateway towards Sewingshields.

Vetoniana is a Roman cohort camp near Pfünz in Bavaria, Germany. Probably constructed around 90 CE as a wooden and earth structure and later rebuilt in stone, Fort Vetoniana was garrisoned by a unit of 500 men, including some cavalry. Of...

Chart Illustrative of the Siege & Defence of Fort Erie. Campaign of 1814, by the War Department, Office of the Chief of Engineers. National Archives and Records Administration, Washington, D.C.