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Lucas did not see any further action but steadily climbed the promotion ladder. He served on Calcutta, Powerful, Cressy, Edinburgh, Liffey and Indus. In 1862 his was promoted to Commander and then to Captain in 1867, before retiring on 1 October 1873. He went to live with his sister and brother-in -law in the Western Highlands until he received a summons to his death bed from his old captain, now Admiral Sir William Hall KCB, FRS, who made an extraordinary request. He begged Lucas to take care of his wife Hilare and to marry his only daughter, Frances. Lucas, an incurable romantic, agreed. The marriage was not a success for Frances was arrogant and violent-tempered and far too aware of her position as a member of the Byng family. being the grand-daughter to the 6th Viscount Torrington. They married in 1879 and produced three daughters.
They made their home at Great Culverden, on the Mount Ephraim area of Tunbridge Wells. In 1885, Lucas was promoted to Rear-Admiral on the retired list. He occupied himself as a JP for both Kent and Argyllshire. After a train journey, Lucas found to his dismay that he had left all his medals in the carriage. They were never recovered. Instead, he was issued with a duplicate group. The IGS bar'Pegu' is engraved with his details, as are both gold Royal Humane Medals. The Baltic Medal is blank, as is the reverse of the Victoria Cross.
Charles Lucas died peacefully at his home on 7 August 1914, just as Europe plunged into the madness of the First World War. He was buried in St Lawrence's Churchyard at the nearby village of Mereworth