sentences:  In 1921 he invaded Guangxi, igniting the Second Ao-Gui War.Lu sent two wings of his army, one led by Tan Haoming and the other under Shen Hongying, into Guangdong where they drove back the Cantonese and occupied Qinzhou and Lianzhou.However, the center at Wuzhou, commanded by Chen Binghun, collapsed and Chen Jiongming drove up the rivers while allies came in from the north, forcing Lu Rongting to step down in July 1921.