dˈʊɹɹɪŋ ðɪ ɐmˈɛɹɪkən sˈɪvəl wˈɔːɹ, lə sˈeɪɹə sˈɜːvd ɪnðə kənfˈɛdɚɹət stˈeɪts ˈɑːɹmi, fˈɜːst æz mˈeɪdʒɚɹ ʌvðə tˈɛnθ luːˌiːzɪˈænɚ ɹˈɛdʒɪmənt, ænd lˈeɪɾɚɹ æz tʃˈiːf kwˈɔːɹɾɚmˌæstɚɹ ʌvðə tɹˈænzmˌɪsɪsˈɪpi dᵻpˈɑːɹtmənt.
During the American Civil War, Le Sére served in the Confederate States Army, first as major of the 10th Louisiana Regiment, and later as chief quartermaster of the Trans-Mississippi Department.