He intended to follow the medical profession, attending lectures in both
Edinburgh and London, and took the degree of
MB in 1800. He was, however, elected
Radcliffe Travelling Fellow on 4 December 1800, and spent the next three years in Germany, France, and Spain. In 1804, he visited
Constantinople,
Asia Minor, and
Syria. The following year, he made his way from
Aleppo to
Persia, fell ill near the
Caspian Sea, and was indebted perhaps for his life to the kindness of some Russian officers. With them, he sailed for the
Volga in November, was shut out by the ice, and had to spend the winter on the desert island of
Kulali, but eventually arrived at
Astrakhan in April 1806, reaching England by way of
St Petersburg on 11 August 1806. In 1808, in a private capacity, Vaughan accompanied
Charles Stuart to Spain, and was present at the assembly of the northern juntas at
Lugo; thence he went to
Madrid, and travelled to
Zaragoza with
Colonel Charles Doyle. On his return to Madrid, he was sent with dispatches relating to the
Battle of Tudela to Sir John Moore at
Salamanca, and returned to England in December 1808. In 1809, he published his
Narrative of the Siege of Zaragoza, which reached a fifth edition within the year. ==Private secretary==