His example was followed, to name only the best known instances, by Bishop Theodore of Octodurum (now Martigny in the Vaud), who discovered the relics of the Theban legion which was alleged to have been destroyed by the emperor Maximian on account of its belief in the Christian faith (see Passio Acaun.
Matriculating at the university of Gottingen in 1811, he began by devoting himself to astronomy under Carl Friedrich Gauss; but he enlisted in the Hanseatic Legion for the campaign of 1813 - 14, and became lieutenant of artillery in the Prussian service in 1815.
Near Figuieres the legion was compelled to surrender, and Carrel became the prisoner of his old general, Damas.
He received the cross of the Legion of Honour in 1862.
Towards the close of the Franco-Prussian War he made an admirable defence of Brest, and his organization of the French expedition to the island of St Paul to observe the transit of Venus in 1874 obtained his election to the Academy of Sciences and his promotion as commander of the Legion of Honour.
He emigrated about 1790, and raised a legion which was to bear his name; but his insolence alienated the German princes, and his command was taken from him.
Nothing loth, he established a revolutionary tribunal, and formed a body of desperate men, called the Legion of Marat, for the purpose of destroying in the swiftest way the masses of prisoners heaped in the jails.
It retained the official title, though it may also have been known as Numidia; together with Africa Vetus it was governed by a proconsul, and was the only senatorial province in which a legion was permanently stationed, under the orders of the senatorial governor.
From France he accepted the grand cordon of the Legion of Honour, and was later enabled to negotiate a loan.
Since 1805 there has existed an institution, Maison d'education de la Legion d'Honneur, for the education of the daughters, granddaughters, sisters and nieces of members of the Legion of Honour.