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| Date from | Date to | Event | Source |
|---|---|---|---|
| 1753 | 1756 | Service as a merchant seaman | ADM 107/5 |
| 7.3.1759 | Passed the Lieutenant's Examination ADM 107/5/106 | ADM 107/5 | |
| 23.3.1759 | Lieutenant | CSORN | |
| 22.6.1764 | 25.4.1768 | , Lieutenant, and Commanding Officer | BWAS-1714 |
| 13.11.1778 | Commander | CSORN | |
| 13.11.1778 | 22.12.1779 | Infernal (8)
1778-1783 , Commander, and Commanding Officer ADM 6/21/474British 8 Gun Unrated Fireship | BWAS-1714 |
| 7.6.1780 | Captain | CSORN | |
| 7.6.1780 | 26.8.1780 | Britannia (100)
1762-1825 , Captain, and Commanding Officer ADM 6/22/140British 100 Gun 1st Rate Ship of the Line 1812 Renamed "Princess Royal" 1812 Renamed "Saint George" 1819 Renamed "Barfleur" | BWAS-1714 |
Inscription in the cloisters of Chichester Cathedral, Sussex, EnglandIn Memory of
Captn. Thomas Allen late Commander of his Majesty's Ship Britannia, on whose brave & benevolent Spirit on the 23rd Jany 1781 in the 55th Year of his age, The Curtain of this World's Stage untimely dropt.