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| Date from | Date to | Event | Source |
|---|---|---|---|
| 2.5.1732 | 4.6.1734 | Tiger (50)
1722-1742 , Volunteer-per-order ADM 6/14/106British 50 Gun 4th Rate Ship of the Line | ADM 6/14 |
| 4.6.1734 | 17.8.1738 | Roebuck (40)
1733-1743 , Volunteer-per-order ADM 107/3/397British 40 Gun 5th Rate Ship of the Line | ADM 107/3 |
| 27.11.1740 | Passed the Lieutenant's Examination ADM 107/3/397 | RNLPC | |
| 2.2.1740/41 | Lieutenant ADM 6/15/375 | CSORN | |
| 11.3.1748/49 | 24.1.1750/51 | Mercury (20)
1745-1753 , Lieutenant ADM 6/17/447British 20 Gun 6th Rate Ship | ADM 6/17 |
| 17.2.1755 | Commander ADM 6/18/349 | CSORN | |
| 17.2.1755 | 4.7.1755 | Kingfisher (14)
1745-1763 , Commander and Commanding Officer ADM 6/18/349British 14 Gun Unrated Sloop Issued by Charles WatsonBritish Naval Sailor Service 1734-1758 Confirmed 27.1.1757 | BWAS-1714 |
| 4.7.1755 | Captain ADM 6/19/132 | CSORN | |
| 4.7.1755 | 2.3.1758 | Cumberland (66)
1748-1760 , Captain and Commanding Officer ADM 6/19/132British 66 Gun 3rd Rate Ship of the Line Issued by Charles WatsonBritish Naval Sailor Service 1734-1758 Confirmed 29.1.1760 | BWAS-1714 |
| 11.1.1756 | 14.1.1756 | Capture of Geriah | |
| 7.3.1757 | 1.4.1757 | Expedition against Chandernagore | |
| 2.3.1758 | 19.12.1760 | Yarmouth (64)
1745-1811 , Captain and Commanding Officer ADM 6/19/292British 64 Gun 3rd Rate Ship of the Line Issued by George PocockBritish , East Indies
Naval Sailor Service 1718-1766 Confirmed 16.3.1760 | BWAS-1714 |
| 29.4.1758 | Battle of Cuddalore | ||
| 3.8.1758 | Battle of Negapatam | ||
| 10.9.1759 | Battle of Pondicherry | ||
| 11.2.1762 | 24.2.1763 | Namur (90)
1756-1804 , Captain and Commanding Officer ADM 6/19/385British 90 Gun 2nd Rate Ship of the Line | BWAS-1714 |
| 6.6.1762 | 13.8.1762 | Operations against Havana | |
| 1763 | Suffered a Stroke of the Palsy from which he never fully recovered and held no further commands as a result | B051 | |
| 1.1.1779 | 27.3.1779 | Included in the list of captains receiving half-pay. | ADM 104 |
| 27.3.1779 | Superannuated Rear-Admiral ADM 6/21/533 | ADM 104 |
He was Buried in Westminster Abbey, where his memorial monument reads:
Near, lies buried rear-admiral JOHN HARRISON, son of captain Robert Harrison, who educated him from his infancy in the navy, having himself served in it forty years. He was captain of the Namur, the ship of admiral sir George Pocock in several successful engagements with the French fleet, commanded by the count D'Ache in one of which he was wounded. He conducted under the same British admiral, the armament against the Havannah, and brought the fleet and treasure safe to England. In consequence of excessive fatigue, soon after his return he lost the use of one side by a paralytic stroke, and remained helpless twenty-eight years. He was firm in action, prudent in conduct, polished in society, generous and humane. in a profession, and upon an element where human virtue is of the most rigid kind, and human nature is nost severely tried, his modesty was equal to his virtues.