General du Teil, younger brother of the baron, had recently published a work, L' Usage de l'artillerie nouvelle; and it is now known that Bonaparte derived from this work and from those of Guibert and Bourcet that leading principle, concentration of effort against one point of the enemy's line, which he had advocated at Toulon and which he everywhere put in force in his campaigns.
Finding Italy uncongenial to his ideas, he went to France and, in 1839, produced in Paris his Vico et l'Italie, followed by La Nouvelle Religion de Campanella and La Theorie de l'erreur.
The story of Hop's expedition is told in the Nouvelle description .du Cap de Bonne Esperance (Amsterdam, 1778).
In 1852 he took part in establishing the Nouvelle Revue de theologie, the first periodical of scientific theology published in France, and in the same year helped to found the "Historical Society of French Protestantism."
Meanwhile he had gained a high reputation as a preacher, and especially as the advocate of religious freedom; but his teaching became more and more offensive to the orthodox party, and on the appearance (1864) of his article on Renan's Vie de Jesus in the Nouvelle Revue de theologie he was forbidden by the Paris consistory to continue his ministerial functions.