He went to Egypt with the Armee d'Orient and served at Salahieh, modern day El Salheya bordering the Sinai Desert, and Aboukir.

He served at Austerlitz and was promoted Colonel-Major of the Chasseurs-a-Cheval de la Garde Imperiale.

[1] He was seriously wounded in his right hip from a heavy calibre artillery piece and died on 10 February 1807 in the manor house of Worienen.

[2] Napoleon granted Dahlmann's widow a pension of 6,000 francs and in 1811 accorded his only son the title of Baron de l'Empire at the age of 10.

On the instructions of Napoleon, Dahlmann's heart was embalmed and taken to Paris where it was laid to rest in the Pantheon.