[1] During the English Civil War, he served in the parliamentary navy commanding the merchantman Caesar in the summer guard of 1642; later that year he was recorded taking castles around the Isle of Wight.
In 1643 he served as rear-admiral in the Irish guard and the following year was active off the Channel Islands and at the relief of Lyme Regis and, in 1645, the siege of Weymouth.
[1] He remained loyal to parliament during the 1648 naval revolt and in February 1649 signed remonstrance congratulating the army and the Commons for restoring liberty.
[1] Following a short period abroad, Jordan resumed his naval career in 1650, was a flag-officer in the First Anglo-Dutch War and a member of the expedition against Algiers and Tunis under Robert Blake in April 1655.
[3] In the Third Anglo-Dutch War, 1672–4., as vice-admiral of the Blue, he led the fleet into action in HMS Royal Sovereign, 100 guns, in the Battle of Solebay, 28 May 1672.