A tale of two pillboxes
Around 6000 pillboxes likely remain in the UK, from maybe 18000-28000 constructed as anti-invasion fixed defence measures during the early years of the Second World War 1 . Two of these, at Portna Lock and Kilrea in County Derry, are physical reminders of how the Bann Valley in Northern Ireland was fortified during the conflict. Invasion was a real fear, especially in the aftermath of the rapid German advance through France and the British retreat from Dunkirk. Initially concrete and steel were at the heart of the anti-invasion defence in both Northern Ireland and the wider UK. The result was a network of fixed positions built to slow any invasion pushing inland from Ireland's north coast. The pillbox at Portna Lock outside Kilrea stands near the lock gates on the Lower Bann, positioned to cover a vital point on the river network between Coleraine and Lough Neagh. The structure is a solid concrete design, with a forward-facing firing slit and a blast wall. It was part of what beca...