Two days after the fight in
Thomas Street, Byrne met with the fugitive Emmet and agreed to go to Paris to procure French assistance. But in Paris, he found Napoleon's attentions (as in 1798) focussed elsewhere. The First Consul used a cessation of hostilities with Britain to pursue a very different venture, the re-enslavement of Haiti. Byrne was commissioned as a captain in Napoleon's Irish Legion. But at a time when Byrne was convinced that "all Catholic Ireland" was "ready to rise the moment a rallying point was offered", the Irish exiles (
Thomas Addis Emmet and
Arthur O'Connor chief among them) could not deflect the First Consul from other priorities. Rather than in Ireland, with his diminishing Irish contingent, Byrne was to see action in the
Low Countries, Germany and
Spain. Byrne rose to the rank of
brigadier general and was awarded the
Legion of Honour in 1813. Following the Bourbon Restoration, with fellow legionnaire
John Allen, Byrne narrowly avoided deportation as a foreign
Bonapartist. An introduction to the
Prince de Broglie, then vice-president of the Chamber of Deputies and two audiences with the Minister of War,
Marshal Henri Clarke, the Duke of Feltre, (a son of Irish parents, who had advised Wolfe Tone) contributed to the latter's decision to quash the deportation order. In August 1817 Byrne was naturalised as a French citizen. For much of the next decade, Byrne found himself effectively retired on half pay. Returned to active military service in 1828, he distinguished himself in the
French expedition to Morea (as did his fellow United Irishman,
William Corbet) during the
Greek War of Independence. He had greatly admired
Byron who died in 1824 having survived the
second siege of Missalonghi.Second siege of Missolonghi| In his memoirs, Byrne dwelt upon the role of atrocity and reprisal in the Greek war, and suggested that the
Ottomans' Egyptian commander,
Ibrahim Pasha, had been as ruthless in this respect as
General Cornwallis in Ireland. Byrne ended the war in 1830 as commander of Morea castle, and in 1835 retired in France with the rank of
Chef de Bataillion.Second siege of Missolonghi| ==Memoirs==