ˌɔn dᵻsˈɛmbɚ twˈɛlv, wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti fˈoːɹ, pɹˈɛzɪdənt ˈeɪbɹəhˌæm lˈɪŋkən nˈɑːmᵻnˌeɪɾᵻd ɡɹˈɛɡ fɔːɹ ɐpˈɔɪntmənt tə ðə ɡɹˈeɪd ʌv bɹˈɛvɪt bɹˌɪɡɐdˈɪɹ dʒˈɛnɚɹəl ʌv vˌɑːləntˈɪɹz tə ɹˈæŋk fɹʌm ˈɔːɡəst wˈʌn, wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti fˈoːɹ, fɔːɹ ɡˈælənt ænd mˌɛɹɪtˈoːɹiəs sˈɜːvɪs ɪnðɪ ɛŋɡˈeɪdʒmənt ænd dᵻfˈɛnsᵻz ʌv ɹˈɪtʃmənd ɔnðə bɹˈɑːk tˈɜːnpaɪk ænd æt ðə bˈæɾəl ʌv tɹᵻvˈɪliən stˈeɪʃən ænd ðə juːnˈaɪɾᵻd stˈeɪts sˈɛnət kənfˈɜːmd ðɪ ɐpˈɔɪntmənt ˌɔn fˈɛbɹuːˌɛɹi twˈɛnti, wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti fˈaɪv.
On December 12, 1864, President Abraham Lincoln nominated Gregg for appointment to the grade of brevet brigadier general of volunteers to rank from August 1, 1864, for gallant and meritorious service in the engagement and defenses of Richmond on the Brock Turnpike and at the Battle of Trevilian Station and the United States Senate confirmed the appointment on February 20, 1865.