This was the first major action in the Allied 15th Army Group's big spring offensive to push the German Army back to and across the River Po and out of Italy. The breakthrough on the British Eighth Army's front was to be made through the Argenta Gap, crossing the Rivers Senio and Santerno towards the Po at Ferrara and releasing armour to swing left and race across country to meet the advancing U.S. Fifth Army completing the encirclement of the German divisions defending Bologna.