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HHER Number:10234
Type of record:Monument
Name:WORLD WAR II ANTI-TANK DITCH, OUTER LONDON STOP LINE WESTERN SECTION, FROM OTTERSPOOL, E OF WATFORD, TO SOUTH MIMMS

Summary - not yet available

Grid Reference:TL 173 003
Map Sheet:TL10SE
Parish:Aldenham, Hertsmere, Hertfordshire
Ridge, Hertsmere, Hertfordshire
St. Stephen, St. Albans, Hertfordshire
Shenley, Hertsmere, Hertfordshire
Map:Show location on Streetmap

Monument Types

  • TANK TRAP (World War II - 1939 AD to 1945 AD)

Protected Status

  • Registered Park or Garden 42: Wall Hall
  • SHINE: WORLD WAR II ANTI-TANK DITCH, OUTER LONDON STOP LINE WESTERN SECTION, FROM OTTERSPOOL, E OF WATFORD, TO SOUTH MIMMS
  • SHINE: Roman site, Netherwylde, Aldenham
  • SHINE: Part of the World War II Outer London Stop Line
  • SHINE: Part of the Outer London Stop Line anti-tank ditch
  • SHINE: Porters Park post-medieval landscape park, incorporating part of the World War II Outer London Stop Line

Full description

Part of the western section of the World War II anti-tank ditch that ran through Hertfordshire as part of the Outer London Defence Ring <1>, still partly extant in APs taken by the RAF in 1946 <1>. Portions are still visible as cropmarks <2>.
See also [10232, 10233, 18018]. The course of the ditch was heavily augmented by pillboxes, seemingly at every directional change. The course of the Defence Ring evidently also made use of the river Colne to form a natural barrier along parts of this stretch.


<1> Hunns, Terry, RAF air photos in Herts County Record Office, digitized and interpreted, 4065-4075 (CPE/UK/1779) (Aerial Photograph). SHT4312.


<2> Hertfordshire County Council, HCC vertical photomapping, 2010 (Aerial Photograph). SHT8853.

Sources and further reading

<1>Aerial Photograph: Hunns, Terry. RAF air photos in Herts County Record Office, digitized and interpreted. 4065-4075 (CPE/UK/1779).
<2>Aerial Photograph: Hertfordshire County Council. HCC vertical photomapping, 2010.

Related records

18019Parent of: CROPMARKS OF POSSIBLE ANTI TANK DITCHES, BINGHAMS, ALDENHAM (Monument)
6606Parent of: PILLBOX, GREEN STREET, SHENLEY (Building)
6658Parent of: PILLBOX, NETHERWYLDE FARM, RIVER COLNE, RADLETT (Building)
6605Parent of: PILLBOX, WOODHALL LANE, SHENLEY (Building)
6604Parent of: PILLBOX, WOODHALL SPINNEY, WOODHALL LANE, SHENLEY (Building)
6735Parent of: SITE OF ANTI-TANK OBSTACLE, NETHERWYLDE FARM, RADLETT (Monument)
6609Parent of: SITE OF ANTI-TANK OBSTACLES, 17-19 LONDON ROAD, SHENLEY (Monument)
10552Parent of: SITE OF CALTROP ANTI-TANK OBSTACLE, NEAR SOUTH MIMMS, POTTERS BAR (Monument)