On 28 July, under the orders of Major General Percy Kirke, three armed merchant ships, Mountjoy, Phoenix and Jerusalem (a cutter) sailed toward the boom, protected by the frigate HMS Dartmouth under Captain John Leake.
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These include the Siege of Derry, particularly the shutting of the gates and the relief of the city, or portraits of Williamite commanders such as the Duke of Schomberg.
Other scenes he painted include the Siege of Derry (1689), and the horse and battle portion of Godfrey Kneller's famous portrait of the Duke of Schomberg, who had been killed at the Battle of the Boyne.
Whilst a captain he distinguished himself in several engagements, especially on 28 July 1689, when he led the convoy that broke the barricading boom at Culmore Fort, thus lifting the Siege of Derry.
The siege of Derry ended when, under the orders of the Dutch Marshall Frederic Schomberg, three armed merchant ships, the Mountjoy, the Phoenix and the Jerusalem, sailed up the River Foyle.
Former Grand Master W. Martin Smyth has said that the Siege of Derry can be seen as symbolising the eternal conflict between good and evil.