Stop Line Defence
Concrete tank obstacle near Longhole Bridge sp 381639. 2017.
Image courtesy of William Arnold
Longhole Canal Bridge, which the tank obstacle presumably was intended to obstruct. 2017.
Image courtesy of William Arnold
The Grand Union Canal was a stop line during World War Two. Tank obstacles and pillboxes were part of the defences intended for its use as a line of defence against any potential German invasion.
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