My great grandmother Annie Ellen Rowland (nee Domville) eloped with Dr McKenna in 1882 when he was Medical Officer for the Bengal 26th Native Infantry. After her divorce from Rev William John Rowland, they married in Marylebone in 1883. He became a Surgeon Lt Col in the Bengal Army and was retired and living at Beyres, Bayonne, France at his death in 1902.
His Will makes no provision for his wife; possibly they were estranged.It also seems likely that there were no children of the marriage, although Annie Ellen was only 30 at the time of her second marriage. The 1911 Census shows her living with her mother who died in 1914.
Annie Ellen died in 1932, being supported in old age by her daughter Lady Agnes Gibbs. I do not know whether she was ever reconciled with her other children.
As ever I am indebted to Jacky Fogerty for some of the details here.