Arundel - Siege and Release of Empress Matilda 1139 was a medieval siege, the investment of a fortified position, fought in England in 1139. Stephen besieged Matilda at Arundel Castle but, on the advice of his brother Henry of Blois, agreed a truce and released her under safe conduct; she was escorted to Bristol and then established her court at Gloucester, securing a western Angevin power base. Chroniclers and later historians regard the release as a major strategic error by Stephen that prolonged the civil war (the Anarchy).
The site of Arundel - Siege and Release of Empress Matilda 1139 lies on White Chalk Subgroup, bedrock that formed in the Maastrichtian. The rock here is chalk.
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