According to David A.Grossman, by the 12th Battle of Isonzo (October–November 1917), while conducting a light-infantry operation, Rommel had perfected his maneuver-warfare principles, which were the very same ones that were applied during the Blitzkrieg against France in 1940 (and repeated in the Coalition ground offensive against Iraq in the 1991 Gulf War). During the Battle of France and against his staff advisor's advice, Hitler ordered that everything should be completed in a few weeks; fortunately for the Führer, Rommel and Guderian disobeyed the General Staff's orders (particularly General von Kleist) and forged ahead making quicker progress than anyone expected, and on the way, "inventing the idea of Blitzkrieg". It was Rommel who created the new archetype of Blitzkrieg, leading his division far ahead of flanking divisions. MacGregor and Williamson remark that Rommel's version of Blitzkrieg displayed a significantly better understanding of combined-arms warfare than that of Guderian. General Hoth submitted an official report in July 1940 which declared that Rommel had "explored new paths in the command of Panzer divisions".