 As the entire Chinese defense of Jehol collapsed, some of Sun's units lost contact to their headquarters and were left behind; one of his regiments consequently launched a counter-attack on Chifeng, not knowing that other NRA forces had already fled the province.As the Chinese high command initially refused to admit that Sun had been bribed, and some troops under his command had valiantly fought the Japanese, Sun's reputation was slightly rehabilitated in course of the campaign, an opportunity he seized to expand his strength.At the time of the Tanggu Truce, Sun's troops garrisoned the strategic Peiking–Suiyuan Railway.