Grim’s Ditch

Grim’s Ditch (also known as Grim’s Dyke) is an ancient earthwork in North West London. The ditch stretches for over 3km from Harrow Weald Common to Cuckoo Hill Bushey Heath in NW London, and after a considerable gap onto Pear Wood in Brockley Hill. The method of building this type of earthwork involved digging a trench […]

Grim’s Ditch (also known as Grim’s Dyke) is an ancient earthwork in North West London.

The ditch stretches for over 3km from Harrow Weald Common to Cuckoo Hill Bushey Heath in NW London, and after a considerable gap onto Pear Wood in Brockley Hill.

The method of building this type of earthwork involved digging a trench and forming the upcast soil into a bank alongside it.

They are too small to have any military application, but archaeologists believe that they may have served to demarcate territory. Excavations in Pear Wood in 1973 proved conclusively that Grims Ditch could not be earlier than 300 BC.

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