 Ramba uchiverenga ndima ino - Boniface de Castellane akapinda muuto reFrance pazuva rokugadzwa kwaNapoleon I weFrance December 2, 1804 somurwi wechiuto mu5th Light Infantry Regiment. Muna February 1806 akasimudzirwa kuva 2nd lieutenant mu7th Dragoons. Mumwedzi iwoyo akaendeswa ku24th Dragoons kwaakashanda muUmambo hweNaples. Muna 1808 de Castellane akatevera mukuru weuto Georges Mouton kupinda muSpain seaide-de-camp. Apo Napoléon akadzokera kuGermany muna 1809, de Castellane akatevera uye akarwa muhondo iyoyo paAbensberg, Eckmühl, Ratisbon, Aspern-Essling uye Wagram. 