The Battle of Eastern Henan was between the Central Army of Chiang Kai-shek and those of Sun Dianying, a Henan native and ally of Feng Yuxiang and Yan Xishan.
Sun's forces attacked the Longhai railway line, a stronghold on the eastern provincial border of Henan.
The railway linked the cities of Kaifeng, Zhengzhou and Luoyang.
Autumn War 2nd main phase