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In the Second Civil War he and Arthur, Lord Capell in raising troops for the Royalists, joined the Earl of Norwich, Sir Charles Lucas and Sir George Lisle in Essex and took part in the Siege of Colchester.
In the English Civil War, the Parliamentary Army built a blockhouse at East Mersea in 1648, with the aim of blockading the River Colne and the besieged town of Colchester.
Barkstead was a goldsmith in London; captain of parliamentary infantry under Colonel Venn; governor of Reading, 1645: commanded regiment at siege of Colchester; one of the king's judges, 1648; governor of Yarmouth, 1649, Lieutenant of the Tower of London, 1652; M.P. for Colchester, 1654, and Middlesex, 1656; knighted, 1656: escaped to continent, 1660; arrested, 1661; brought to England and executed.