[5] In July 1835, de Ros and the Earl of Durham travelled to the Black Sea for half a year to investigate Russian military preparations.

[7] Lord de Ros served as Quartermaster-General for the British Army in Turkey during the Crimean War between April and July 1854,[8] being promoted major-general on 20 June 1854.

[12] In February 1852 Lord de Ros was appointed Captain of the Yeomen of the Guard in the Earl of Derby's first administration,[13] and sworn of the Privy Council.

[14] The government fell in December 1852,[15] but when Derby returned to office in February 1858, de Ros was once again made Captain of the Yeomen of the Guard.

They had three children: Lord de Ros died at Old Court, Strangford, County Down, in January 1874, aged 76, and was succeeded in the barony by his only son, Dudley.