In August and September 1937, Sagardía Ramos took part in the War in the North and participated in the Battle of Santander, at the head of the so-called "Sagardía Column"; the unit exercised a harsh repression against the civilians and soldiers of the Republican faction, including numerous extrajudicial killings. After the War in the North ended, the "Sagardía Column" was reorganized as the 62nd Division of the , at the head of which he took part in the Aragon Offensive. In April 1938, Sagardía's troops were deployed in the Battle of the Segre, in which they hardly encountered any resistance. But in the face of casualties suffered by his column after a Republican attack, he said: