British hardened field defences of World War II

Hexagonal pillbox (Type 22)

British hardened field defences of World War II were small fortified structures constructed as a part of British anti-invasion preparations. They were popularly known as pillboxes, a reference to their shape.[1]

  1. ^ John Hellis. "Why Pillbox?". Pillbox Study Group. Archived from the original on 26 September 2009. Retrieved 10 September 2009.