Earl of Inchquin, of six guns and under the command of Lieutenant William Robertson, was in the Channel when she encountered Duc de Chartres, which gave chase.

[5][6] In March 1781 Lloyd's List reported that Duc de Chartres had captured the Bristol privateer Chance, Webb, master.

On the way the fleet captured Duc de Chartres, the Spanish frigate Santa Leucadia, and the French brig Trois Amis.

Although HMS Cumberland executed the actual capture of Duc de Chartres, the entire British fleet of 42 vessels shared in the resulting prize money.

The Royal Navy commissioned Duc de Chartres under Commander John Child Purvis on 7 October 1781 and he immediately sailed her for North America.

In the subsequent hour-long action, Aigle lost 13 men killed, including her captain, and 15 wounded; Duc de Chartres had no casualties.

[10][Note 2] On 15 March 1783 the British frigates Astraea and Vestal, and Duc de Chartres captured the Massachusetts letter of marque Julius Caesar.

[12] Julius Caesar was a privateer of eighteen 9-pounder guns and carried a crew of 100 men under the command of Captain Thomas Benson, of Salem.