Maneuver and Attrition: Two Theories of Winning Wars

In 1940, a German armored column drove through the Ardennes forest, crossed the Meuse at Sedan, and within six weeks forced the surrender of a French army that on paper was its equal in men and superior in tanks. In 1916, on the chalk uplands above the Somme, a British and French offensive ground forward a few miles over five months at a cost of more than a million casualties on all sides. Both campaigns were attempts to win a war. They embody two very different ideas about how wars are won.

The first idea is usually called maneuver warfare. Its premise is that an army's fighting power depends on cohesion — on units knowing where they are, trusting their flanks, receiving orders, and believing the situation is under control. Break that cohesion, and the army's nominal strength becomes irrelevant. A maneuverist seeks not to destroy the enemy piece by piece but to dislocate him: to appear in his rear, sever his communications, threaten his command posts, and force him into decisions he cannot execute fast enough. The German operational tradition from Moltke the Elder through the 1940 campaign and into postwar U.S. Marine Corps doctrine treats the enemy's mind, not his body, as the target.

The second idea is attrition warfare. Its premise is that armies are, finally, accumulations of soldiers, weapons, and the industrial base behind them, and that wars are decided when one side can no longer replace what it loses. An attritionist accepts that the enemy will not collapse from a clever stroke and plans instead to grind down his combat power, his manpower pool, and his political will until continuing the war costs more than any plausible gain. Ulysses S. Grant's 1864 Overland Campaign, in which the Army of the Potomac took staggering casualties but kept Lee's smaller army in continuous contact, is often cited as the model: not elegant, but decisive over time.

It is tempting to read these as a contest between the clever and the brutal, with maneuver as the sophisticated choice. The historical record resists that reading. Maneuver succeeds when the attacker has a real edge in tempo, communications, or leadership, and when the defender's system is brittle enough to crack under shock. Where those conditions are absent — where both sides field competent, redundant, well-supplied forces across a continuous front — maneuver tends to degrade into attrition whether the planners intended it or not. The Western Front from 1914 to 1917 is largely a record of maneuver schemes that arrived at battlefields where no maneuver was possible.

The distinction also softens under examination. Attritional pressure can create the conditions for a maneuver stroke: by mid-1918, German manpower had been so depleted by four years of grinding combat that Allied offensives finally found exploitable gaps. Conversely, a maneuver victory often consummates an attritional process already underway. France in 1940 was not only outmaneuvered; it was also politically exhausted, doctrinally rigid, and operating a command system the Germans had spent years studying. The Ardennes thrust worked partly because the target was already fragile.

What the two theories really disagree about is where the decisive variable lies. Maneuverists locate it in the enemy's coherence as a fighting system; attritionists locate it in the material and human resources sustaining that system. Each is sometimes right. A strategist who treats either as a universal law tends to be wrong in the cases where the other applies — committing to grand encirclements against an opponent whose depth absorbs them, or to attritional grinding against an opponent whose collapse was available at lower cost. The serious question is rarely which theory is correct. It is which one describes the war actually being fought.