ˌɔn dʒˈænjuːˌɛɹi θˈɜːtiːn, wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti sˈɪks, pɹˈɛzɪdənt ˈændɹuː dʒˈɑːnsən nˈɑːmᵻnˌeɪɾᵻd ɡɹˈɛɡ fɔːɹ ɐpˈɔɪntmənt tə ðə ɡɹˈeɪd ʌv bɹˈɛvɪt mˈeɪdʒɚ dʒˈɛnɚɹəl ʌv vˌɑːləntˈɪɹz tə ɹˈæŋk fɹʌm mˈɑːɹtʃ θˈɜːtiːn, wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti fˈaɪv, ænd ðə jˈuː.ˈɛs. sˈɛnət kənfˈɜːmd ðɪ ɐpˈɔɪntmənt ˌɔn mˈɑːɹtʃ twˈɛlv, wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti sˈɪks.
On January 13, 1866, President Andrew Johnson nominated Gregg for appointment to the grade of brevet major general of volunteers to rank from March 13, 1865, and the U.S. Senate confirmed the appointment on March 12, 1866.