[1] During the War of the Sixth Coalition (1812–14), he served as a volunteer in a Landwehr installation.

There he published a historical paper and another one on building connections between the sciences and humanities in gymnasium studies.

[1] There he also became involved with the issuance of new editions of Karl Friedrich Becker's "Weltgeschichte" (World history).

During this time period he was friends to Henrich Steffens (1773-1845) and Friedrich von Raumer (1781-1873).

Among the works he wrote at Bonn were "Gregor von Tours und seine Zeit" (Gregory of Tours and his times, 1839), a revision of Becker's "Weltgeschichte" (1836–38), "Weltgeschichte in Umrissen und Ausführungen" (World history outlined and explained Part I, 1846), "Die Entwicklung der deutschen Poesie von Klopstocks erstem Auftreten bis zu Goethes Tode" (The development of German poetry from Klopstock until Goethe's death, 1856–65), and "Historische Briefe" (Letters on history, 1861), an anonymous attack on Ultramontanism.