The closing days of the First World War gave birth to modern combat. Previous to these developments, advances in firepower made titans of the trenchworks. For four years the trenches were assaulted: for four years storms of steel mowed all offensives down. But as the war reached its end tactics were developed to storm through the gauntlet. Stephen Biddle has called these tactics, and what evolved out of them, “the modern system of battle.” The closing developments of the 1918 made offensives possible again—but the playing field remained tilted towards the defender.