 Sir Edmund Fortescue was ordered to hold it in 1643, when nearby Plymouth rose against the king; he rebuilt the castle at a cost of £135 6s 11d, and gave it the name "Fort Charles".The castle was besieged from 15 January to 7 May 1646, and surrendered then only because it became clear that all other royalist strongholds had been overrun; the garrison were allowed to withdraw with their colours flying.After the Civil War the castle was "slighted" (ruined) on the orders of Parliament as it was "too dangerous" to allow it to remain.