HMS ACORN (18)  On 28 July 1809, an enemy convoy was sighted standing along the northern coast towards Trieste, Capt. John WEST in HMS EXCELLENT anchored near the shore and cut them off from their destination.

The enemy took shelter in Duino, about 12 miles to the north-west of Trieste, where, covered by the fire of AC0RN and BUSTARD, the squadron's boats under Lieut. John HARPER, 1st Lt of EXCELLENT, went in and took complete possession of six Italian gunboats and ten trabaccolas which were loaded with brandy, flour, rice and wheat. Capt. CUMMINGS of the Royal Marines took a small party ashore to protect the people launching the prizes from musket fire from the cliffs around the port.  

HMS AC0RN had no casualties.  In 1810 the squadron in the Adriatic consisted of AMPHION, ACTIVE, CEREBUS, all 32-gun frigates, and ACORN.

0n 6 0ctober HMS AMPHION and HMS ACTIVE sighted a large French fleet off Ancona. 0utnumbered they sailed for Lissa (Vis) to collect CEREBUS and ACORN but while they were returning to Ancona the French raided Lissa and burnt the shipping in Port St. George.

In 1811 She formed part of the force employed protecting Lissa under Capt. Murray MAXWELL. ACORN was lying at Port St. George in Lissa (Vis) on 28 November 1811 when 3 strange sails were seen to the southward. The 3 frigates in the harbour, ALCESTE, ACTIVE and UNITE, sailed in pursuit leaving their marines with HMS AC0RN to protect the island.
 

HMS ACORN,(16). (1838 Devonport. Hulk 1861) Built to the design of Sir William SYMONDS as a sister ship to HMS PILOT.

 
Launched at Devonport 15 November 1838. She was first commissioned in January 1839 by John ADAMS with a crew of 71 officers and men, 24 boys and 20 marines, and on 21 March she sailed from Plymouth for the Cape of Good Hope Station as part of the anti-slavery operations. She returned to Plymouth in April 1841 and sailed again two months later on 11 June for Rio de Janeiro. Among her numerous prizes the most celebrated was the capture of the slaver brig GABRIEL on 6 July 1841.

She returned to Plymouth in September 1843 and was laid up out of commission in the Hamoaze (the stretch of the River Tamar past the Dockyard).

 
She was recommissioned again in 1856 by Cdr. A. W. HOOD for service on the China station where she took part in the capture of Canton in December 1857. She was later used as a coal hulk and a hospital ship. She was sold at Yokohama in 1869.