Admiral Edward Stafford Fitzherbert, 13th Baron Stafford, KCB (17 April 1864 28 September 1941) was an English peer, holding the title Baron Stafford. He was also a Royal Navy officer who went on to be Commander-in-Chief, Cape of Good Hope Station.

Can we draw the following conclusion?
Fitzherbert's career started with him being the Royal Navy officer.
It's impossible to say