defeat
... that Emperor Gaozong of Tang controlled the former Western Turkic Khaganate through military garrisons and proxy rulers following General Su Dingfang's defeat of the Western Turk qaghan Ashina Helu in 657?
... that <a href="./Emperor_Gaozong_of_Tang" id="mwDJA" rel="mw:WikiLink" title="Emperor Gaozong of Tang">Emperor Gaozong</a> of <a class="mw-redirect" href="./Tang_Dynasty" id="mwDJE" rel="mw:WikiLink" title="Tang Dynasty">Tang</a> <i id="mwDJI">(pictured)</i> controlled the former <a href="./Western_Turkic_Khaganate" id="mwDJM" rel="mw:WikiLink" title="Western Turkic Khaganate">Western Turkic Khaganate</a> through <a href="./Four_Garrisons_of_Anxi" id="mwDJQ" rel="mw:WikiLink" title="Four Garrisons of Anxi">military garrisons</a> and proxy rulers following General <a href="./Su_Dingfang" id="mwDJU" rel="mw:WikiLink" title="Su Dingfang">Su Dingfang</a>'s <b id="mwDJY"><a href="./Conquest_of_the_Western_Turks" id="mwDJc" rel="mw:WikiLink" title="Conquest of the Western Turks">defeat</a></b> of the Western Turk qaghan <a href="./Ashina_Helu" id="mwDJg" rel="mw:WikiLink" title="Ashina Helu">Ashina Helu</a> in 657?