tˈɪndɔːl sˈɜːvd æz ɐ mˈeɪdʒɚɹ ɪn kəmˈænd əvə bɐtˈæliən ʌvðɪ ˌɪndiːˈænə fˈiːld ɑːɹtˈɪlɚɹi, wˌɪtʃ wʌz æt sˈɜːvɪs ɔnðə mˈɛksɪkən bˈoːɹdɚ wɛn ðə juːnˈaɪɾᵻd stˈeɪts dᵻklˈɛɹd wˈɔːɹ ˌɔn dʒˈɜːməni ɪn nˈaɪntiːnhˈʌndɹɪd sˈɛvəntˌiːn.
Tyndall served as a major in command of a battalion of the Indiana Field Artillery, which was at service on the Mexican border when the United States declared war on Germany in 1917.