Whakaotihia te rerenga e whai ake nei: I uru a Boniface de Castellane ki te ope French i te ra o te koropiko o Napoléon I o France (2 o Tihema 1804) hei hoia i whakauruhia ki te 5th Light Infantry Regiment. I te Hui-tanguru 1806 i whakatairangahia ia hei tuarua tuarua i te 7th Dragoons. I taua marama ano i whakawhitihia ia ki te 24th Dragoons i mahi tahi ai ia ki te Basileia o Naples. I te tau 1808 i whai a de Castellane i a Georges Mouton ki Spain hei "aide-de-camp". I te hokinga mai o Napoléon ki Tiamana i te tau 1809, ka whai atu a de Castellane, ka whawhai ia i taua pakanga i
Abensberg, Eckmühl, Ratisbon, Aspern-Essling me te Wagram.