But the difficulty of crossing the desert to the Saudis stronghold of Diriyah, some 400 miles east of Medina made the conquest a very arduous one.
Letellier was retired in 1816, and left for Egypt where he served as an advisor to Ibrahim Pasha, though he stayed ashore during the Battle of Navarino, as staying on board Egyptian ships would have entailed facing the French Navy.
Along with Demetrius Ypsilanti, he commanded the forces that saved Nauplio from Ibrahim Pasha of Egypt.
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Visitors included the Prince of Wales, the German statesman Otto von Bismarck, Prince Louis-Napoléon Bonaparte, Ibrahim Pasha of Egypt, the Austrian general Julius Jacob von Haynau, who was attacked by draymen while touring the brewery in 1850, and the Italian nationalist Giuseppe Garibaldi in 1864.
From 1834 to 1837, he was Aide-de-Camp of French-born adventurer Suleiman Pasha, and then Chief-of-Staff of the Egyptian Sultan Ibrahim Pasha during the Egyptian campaigns in Syria.