Robert Crossman returned to Berwick and acquired the manor of Holy Island and the family property at Cheswick, Northumberland.
He returned to England and from 1857 to 1861, he was under Inspector-General of Fortifications at the War Office, becoming captain in 1858.
In 1875, he was in charge of the Royal Commission into the Black Flag Rebellion at Griqualand West which was appointed by Lord Carnarvon and sat in Kimberley in January 1876.
In 1881 he was on special service to report on the defences of the principal colonies – which included a visit to New Zealand.
[8] Crossman's official residence was Cheswick, Beal, Northumberland, but he died in Plymouth at the age of 70.
[9] They had six children,[9] including sons Robert and Lawrence, and daughters Mary and Alice.