John Campbell was born in June 1723, the son of John Campbell, 4th Duke of Argyll. He was educated at a private school in London and commissioned in 1739. He became lieutenant colonel commanding the 30th Regiment early in 1745 and was posted to Scotland where he fought at Loch Fyne. He went on to see action under Lieutenant General Henry Hawley at the Battle of Falkirk Muir in January 1746. He also served under the Duke of Cumberland at the Battle of Culloden where the Jacobites were finally defeated in April 1746. He commanded the Black Watch from 1749 to 1755 while the regiment served in Ireland. His military career included the colonelcy of at least 4 regiments and ended with the appointment of Field Marshal.
He was married to Elizabeth, Baroness Hamilton of Hameldon, daughter of Colonel John Gunning and Hon Bridget Bourke. In retirement the Duke lived at Inveraray Castle and became an expert on agricultural improvement with a seat on the Board of Agriculture. He died at the age of 82 on 24 May 1806 and was buried at Kilmun Parish Church. They had two sons and two daughters. He was succeeded by George Campbell, 6th Duke of Argyll. His second son John became the 7th Duke.
1723 Born in June
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