Siege of Basing House (Royalist relief 1644) was a Civil War siege, the investment of a fortified position, fought at Hampshire, England in 1644. Royalists (garrison held, relieved twice by Gage) prevailed over Parliamentarians. Parliamentary forces under Norton and then Waller blockaded and assaulted Basing House from June 1644; Colonel Henry Gage broke through the siege lines with a relief column on 12 September 1644 (Wikipedia gives 12 September; britishbattles.com gives the march setting off 9 September and breaking through around 11-12 September), resupplying the garrison and capturing prisoners in a sortie, then withdrew safely to Oxford. Disease-weakened Parliamentary besiegers withdrew into winter quarters by 15 November 1644, after which Gage delivered a second unopposed relief convoy of 1,000 cavalry on 20 November 1644. The garrison held out through 1644 (it fell only in the final storming of October 1645, a separate action).
The site of Siege of Basing House (Royalist relief 1644) lies on White Chalk Subgroup, bedrock that formed in the Maastrichtian. The rock here is chalk.
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