Royalist garrison of 44 men under Colonel William Owen; besieging Parliamentarian force led by Major-General Thomas Mytton (size not specified in sources).
Siege of Harlech Castle 1647 was a Civil War siege, the investment of a fortified position, fought at Merionethshire, Wales in 1647. Parliamentarians prevailed over Royalists. The Royalist garrison under Colonel William Owen surrendered to Major-General Thomas Mytton on 15 March 1647; Harlech was the last mainland Royalist fortress to surrender in the war, ending the first phase of the Civil War.
The site of Siege of Harlech Castle 1647 lies on Lower Cambrian Rocks (Undifferentiated), bedrock that formed in the Early Cambrian. The rock here is sandstone and conglomerate, interbedded.
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