Yup the creeping barrage. It was more of a thing in WW1 to get rid of the literal miles of barbed wire so densely packed that a rabbit could hardly get through. They had to legit pound the wires with shells for days before they would be maybe able to move. By WW2 you had functional communication, better understandings of where your forces are as they move, and more barrages going after actual enemy formations rather than clearing wires