On 11 June it was used, without success, in a counterattack against the nationalist advances on Borriol. Involved in the defense of Castellón, it covered the Sant Joan de Moró sector, resisting attacks on 13 June. After Castellón fell on 14 June, it retreated behind the Mijares river, defending the accesses to Burriana and Onda. After containing the rebels in this area, the division began to reorganize itself into the rear and to depend on the XXII Army Corps. During the nationalist offensive on the XYZ line, the 70th Division remained in reserve. With the start of the Battle of the Ebro the nationalist offensive against Valencia ended, and the division enjoyed a period of calm after 8 months of fighting.