Turret 21A, known as Red House, was one of the standard interval watchtowers built into the curtain of Hadrian's Wall, positioned between Milecastles 21 (Down Hill) and 22 (Errington Arms) in the central sector east of Halton Chesters. Like other turrets on the Wall, it was constructed in the 120s AD under Hadrian and would have been a roughly square stone tower (c. 4.3 m square internally) projecting from the rear face of the Wall, manned by a small detachment drawn from the nearest auxiliary garrison. It was likely occupied intermittently into the later 2nd century before being abandoned, as was typical for turrets in this stretch, during the Antonine or Severan reorganisations.
Source: Pleiades — A Community-Built Gazetteer and Graph of Ancient Places. View the Pleiades record →
As part of the regularly spaced surveillance system (two turrets between each milecastle), Red House contributed to observation, signalling, and frontier control along a sector overlooking the Tyne valley approaches, rather than holding independent strategic importance. Its significance lies primarily in its place within the integrated linear system rather than as a distinct installation.
This turret has seen only limited investigation and is not among the well-excavated examples (such as Turrets 7B, 18A, or 26B); its position is known largely from the regular spacing predicted by the Wall's surveying scheme and from antiquarian and field observation. No substantial published finds assemblage is associated specifically
Turret 21A, known as Red House, was one of the standard interval watchtowers built into the curtain of Hadrian's Wall, positioned between Milecastles 21 (Down Hill) and 22 (Errington Arms) in the central sector east of Halton Chesters. It is recorded in the Pleiades gazetteer of ancient places as a watch tower site from the Roman period in Britain.
Turret 21A (Red House) is classified as a Roman watch tower — a military site in the Pleiades ancient world gazetteer. Roman Britain's archaeology encompasses thousands of sites ranging from legionary fortresses and marching camps to villas, temples and towns.
Several Roman sites lie within a short distance, including Onnum (0.2 km), Turret 21B (Fence Burn) (0.4 km), Milecastle 21 (Down Hill) (0.6 km). Aubrey Research maps over 2,200 Roman sites across Britain, drawn from the Pleiades ancient world gazetteer.
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