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| Date from | Date to | Event | Source |
|---|---|---|---|
| 1747 | Appointed Viscount Garlies | E-WIKI | |
| 1753 | 1755 | Service as a merchant seaman | ADM 107/5 |
| 3.10.1759 | Passed the Lieutenant's Examination ADM 107/5/145 | RNLPC | |
| 10.12.1759 | Lieutenant | CSORN | |
| 24.9.1773 | Succeeded as 7th Earl of Galloway | E-WIKI |