He was promoted to the rank of Major-General and appointed a Knight Commander of the Order of the Bath (KCB) in 1815,[1] and in the same year was responsible for informing Napoleon of his sentence of deportation to St Helena.
Bunbury was the author of historical works, the most notable being his military memoirs Narratives of Some Passages in the Great War with France, first published in 1854.
"Henry Bunbury's Great War with France is perhaps the most valuable record... which any soldier has bequeathed to us of the long struggle that began in 1793 and ended in 1815. and it derives its value from the fact that the author was not only a good soldier, well skilled in his profession, but that he was, as a staff officer, thrown with the best British commanders... of his day; that he had opportunities of discussing with them every point of military policy and the details of many important campaigns; and that further he was a highly educated gentleman, with a seeing eye, a kindly nature, a keen sense of the ridiculous, and a very real literary gift.
He remarried Emily Napier (daughter of Lady Sarah Lennox and cousin of the same Henry Edward Fox) on 22 September 1830.
His second son, Sir Edward Herbert Bunbury, also a member of Parliament, was well known as a geographer and archaeologist, and author of a History of Ancient Geography.