At dawn on August 9, 1st Cavalry Division learned of the North Korean crossing. KPA infantry had gathered on Hill 268, also known as Triangulation Hill, which was southeast of Waegwan and northwest of Taegu. The hill was important for its proximity to lines of communication, as the main Korean north-south highway and the main double-track Seoul-Pusan railroad skirted its base. 1st Cavalry Division counterattacked the KPA gathering to force them back across the river, but their initial assault was repelled. The next morning, August 10, air strikes and artillery barrages rocked Hill 268, devastating the KPA, who withdrew back behind the river.