ɪn nˈaɪntiːnhˈʌndɹɪd sˈɪksti fˈoːɹ, wɪð səksˈɛsɪv dᵻfˈiːts ɪn ˈɔːl bˈæɾəlfˌiːldz, ðə ɡˈʌvɚnmənt ʌvðə sˈaʊθ vˌiːətnˈɑːm tɹˈaɪd tə stɹˈɛŋθən ɪts fˈoːɹsᵻz baɪ ˈɑːkjʊpˌaɪɪŋ kˈiː mˈaʊntɪnəs ˈɛɹiəz ɪn ˈɔːɹdɚ tə kəntɹˈoʊl ðə bˈeɪsᵻz ʌvðə vˌiːət kˈɑːŋ.
In 1964, with successive defeats in all battlefields, the government of the South Vietnam tried to strengthen its forces by occupying key mountainous areas in order to control the bases of the Viet Cong.