Qualla: Fortifications of Guernsey

Fortifications of Guernsey: Introduction

Wed, 20 May 2026 00:00:00 GMT

Photo credit Man vyi, Public domain. Stand on any headland in Guernsey and you can see a fortification. Look closer and you can usually see three. The 78-square-kilometer island has been fortified continuously for roughly four thousand years - longer than England has been a kingdom. Iron Age ramparts at Jerbourg dating from 2000 BC, medieval castles at Vale and Castle Cornet, fifteen Napoleonic loophole towers, three Martello towers, the great Georgian star of Fort George, Victorian batteries, and finally the German concrete that buried it all in 1942: every wave of military technology has left its sediment on the coast. Almost nothing built here has ever been entirely demolished. The new defenders simply built on top.

Image: Man vyi | Public domain

Fortifications of Guernsey: Iron Age Refuges

Wed, 20 May 2026 00:00:00 GMT

Photo credit Man vyi, Public domain. The earliest Guernsey defences were not so much forts as places to flee. Jerbourg Point, the narrow headland at the island's southeast tip, was sealed off with three ditches and earth banks around 2000 BC, a Bronze Age refuge for islanders running from raiders. Three other strong...

Image: Man vyi | Public domain

Fortifications of Guernsey: Castle Cornet and the Coming of Gunpowder

Wed, 20 May 2026 00:00:00 GMT

Photo credit Surgeonsmate at English Wikipedia, CC BY-SA 3.0. Castle Cornet, started in the late 13th century on a tidal islet off St Peter Port, became the island's keystone fortification. Between 1545 and 1548 it was remodeled for gunpowder warfare, its walls thickened to absorb cannon fire. During the Third English Civil War, while the r...

Image: Surgeonsmate at English Wikipedia | CC BY-SA 3.0

Fortifications of Guernsey: Fifteen Towers, One Star Fort

Wed, 20 May 2026 00:00:00 GMT

Photo credit Richard asr, CC BY-SA 3.0. The 18th century arrived with constant fear of France. The Seven Years' War, the American Revolutionary War, the French Revolutionary Wars - each pulled Guernsey closer to the front line. Between 1778 and 1779 the British put up fifteen Guernsey loophole towers, squat round stone...

Image: Richard asr | CC BY-SA 3.0

Fortifications of Guernsey: 616,000 Cubic Meters of Concrete

Wed, 20 May 2026 00:00:00 GMT

Photo credit Man vyi, Public domain. The story of Guernsey's fortifications might have ended with the Victorians, who replaced 24-pounders with 68-pounders and added bunkers and glacis. But in June 1940 the British government quietly demilitarized the Channel Islands and pulled the militia. Wehrmacht troops landed a...

Image: Man vyi | Public domain