the main attack started on 6 april with an artillery bombing of the senio defenses. on 9 april, 825 heavy bombers dropped bombs near the senio. from 15:20 to 19:10, artillery was fired. as well, 28 churchill crocodiles and 127 wasp flamethrower vehicles were sent out. by 12 april, the 8th indian division was on the far side of the santerno. the british 78th division moved to attack argenta.