Here is the background to the Impregnable picture above. Fascinating...
In 1862 a new training ship joined the establishment at Devonport, "HMS Impregnable". She had been launched at Chatham Dockyard in July 1810 and
as a 98-gun three-decker of 2,278 tons, was almost a copy of "HMS Victory".
She had entered service in 1812 and two years later was chosen to be the flagship of Admiral the Duke of Clarence, who later became King William IV.
The ship took an active part in the bombardment of Algiers in 1816, when Lord Exmouth was sent to stamp out piracy in the Mediterranean.
The "Impregnable" saw little further action, apart from another short commission in the Mediterranean, and in 1819 she was put into the reserve
fleet at Devonport.
From May 1839 until October 1841 she had relieved "HMS Adelaide" as the Commander-in-Chief's flagship moored at the entrance to the Hamoaze. She
then saw service in the Mediterranean until May 1843, when she again returned to Devonport's Reserve Fleet. In 1862 she, too, became a training