During the Anglo-Zulu War of 1879, Cecil D'Arcy was an officer in the Frontier Light Horse, a mounted unit of 200 volunteers raised at King William's Town in 1877 by Lieutenant Frederick Carrington. At the Battle of Hlobane on 28 March 1879, his unit acted as the rearguard and 20% of the 156 members were killed. D'Arcy was recommended for the VC by Evelyn Wood for going back to save the lives of wounded men in the descent of Devil's Pass; the award was not approved on the grounds that he was a volunteer and not a member of the imperial forces. Five other awards were approved, including to Colonel Redvers Buller; he had rescued D'Arcy who was retiring on foot and carrying him on his horse, while hotly pursued by Zulus. At the Battle of Kambula on the following day, the Frontier Light Horse were part of the pursuit of the retreating Zulu forces. Captain D'Arcy wrote in a letter published in The Natal Mercury in April that they "followed them for eight miles, butchering the brutes all over the place. I told the men, 'No quarter, boys, and remember yesterday'. And they did knock them about, killing them all over the place." The FLH men extracted a savage revenge for their comrades killed the day before at Hlobane. He was awarded the VC for his actions on 3 July 1879 when a mounted reconnaissance was ambushed near Ulundi. In a dispatch dated 5 July in The London Gazette, Redvers Buller wrote that D'Arcy "reckons neither personal inconvenience nor danger in the execution of any order, determined and bold; he has frequently shown great personal gallantry, and has always given a fine example to his men." The citation of the VC award reads; He was presented with his medal in December 1879 by Sir Garnet Wolseley in Pretoria.
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After the Frontier Light Horse was disbanded, D'Arcy joined the Cape Mounted Riflemen as a captain. He served in the 1880 Basuto Gun War but resigned his commission in April 1881. In ill health, he stayed with Rev. Charles Taberer in Keiskammahoek to recuperate. During the night of 6–7 August 1881 he left the house; his body was not found for several months. He was interred on 3 January 1882 in the cemetery of King William's Town beside his parents. He is also considered South African, though he probably considered himself British or Anglo-Irish.