In 870 Dumbarton was besieged by Amlaib Conung and Ímar, "the two kings of the Northmen", who "returned to Dublin from Britain" the following year with numerous captives.
The castle was quickly starved into submission, and Thweng and FitzWarin were taken prisoner to Dumbarton Castle.
FitzWarin, with Thweng were committed as prisoners to Dumbarton Castle.
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The French envoys, Jacques de la Brosse, with his colleague, the lawyer, Jacques Ménage, seigneur de Caigny, and the Papal Legate Marco Grimani, Patriarch of Aquileia, brought money and munitions to Dumbarton Castle on 6 October 1543, and unwittingly delivered them to Lennox.
As Scotland and England moved closer during the seventeenth century, following the Union of the Crowns, the need for a navy to protect Scotland from the English Royal Navy lessened and by the time of the Union with England in 1707, the Royal Scottish Navy possessed just three ships: The Royal William, The Royal Mary, and Dumbarton Castle.