Fort Saumarez, Coastal defense tower in Saint Peter's, Guernsey

Fort Saumarez is a coastal defense tower in Saint Peter's, Guernsey featuring a Martello tower with exterior staircases leading to the second floor. The roof is topped with a 24-pounder carronade, and the structure sits on the northern tip of L'Erée headland.

Lieutenant Governor Sir John Doyle had a local builder named Gray erect the Martello tower in 1804 on the site of an existing battery, bypassing the Ordnance Corps by classing the work as "fieldworks". The tower was named for Guernsey-born Captain Sir James Saumarez, then commanding British naval forces in the Channel Islands. In 1852 the battery received 32-pounder guns and 8-inch shell guns. During the German occupation the site became Stützpunkt Langenberg, with a four-storey concrete observation tower built on top.

Lieutenant Governor Sir John Doyle named the tower for Guernsey-born Captain Sir James Saumarez, then commanding British naval forces in the Channel Islands. Doyle had a local builder named Gray construct it, along with two other towers, as "fieldworks" to bypass the Ordnance Corps. The site later became the German Stützpunkt Langenberg.

Fort Saumarez is privately owned and not publicly accessible, so the tower and its German observation top can only be seen from outside. The trench system and Tobruk ringstand west of the tower, dug during the German occupation, can be explored on foot. The headland lies at the northern tip of L'Erée, near the Lihou causeway.

German forces positioned a four-story concrete observation tower atop the original structure during World War II. This addition with gun casemates and generator tunnels remains visible today, showing two distinct military eras layered at the same location.