[1] Frost served in South Africa during the Second Boer War, first as a trooper with the Royal Wiltshire Yeomanry contingent to the Imperial Yeomanry, and from November 1901 with the 3rd (Militia) Battalion of the Cheshire Regiment, where he was commissioned a second lieutenant.

He was promoted to lieutenant on 31 May 1902,[2] and left South Africa with the rest of the battalion in September 1902, after the end of the war.

On 21 September 1914 he transferred to the Supply & Transport Corps of the British Indian Army.

[5] On retirement from the Army in October 1930 with the rank of colonel and honorary brigadier-general, he then worked as a missionary in the North-West Frontier until 1945.

Their son was John Dutton Frost, an officer who served in the Parachute Regiment during the Second World War.