Skirmish near Nanzheng

Upon the declaration of war on Wei by Shu, Sima Yi sends his troops to the land between Ye Valley and Han River. Ma Chao and Wei Xiadi, under the orders of Wei Guozhi (the new Regent of Shu), march out from Nanzheng. Ma Chao sees that Sima Yi chose a position between two natural barriers, and cannot be flanked.