THEORY
When I was posting the other day, I used the term center of gravity. the phrase then rattled around in my brain, in large part because it's one of those terms that people who have studied military affairs for a while use without thinking. It's a trickier concept than it looks, so I kicked myself for not having included it in the "hallowed principles of strategy" postings I've made for the last few months. Today, I'll correct that omission.
The center of gravity, as its name implies, is the defining characteristic of a conflict. At the risk of mixing metaphors, it's the proverbial lynchpin on which victory and defeat turn. Every war has its center of gravity, which (like war aims) may change over time.
In conventional wars, the center of gravity usually has been the two contending armies. In the ancient and medieval worlds, the opponents would maneuver until they joined battle. The result of that clash of arms was swift (no more than a single day) and decisive, since one side or the other usually lost the military strength to continue the fight. Each side's center of gravity was immediately visible, as a single army on the march across a contested landscape. Think of Edward III's march across northern France, ending in the battle of Crecy; Alexander's march across the Persian empire, ending in the battle of Gaugemala; or Caesar's cat-and-mouse maneuvering against Pompey, ending in the battle of Pharsalus. Even if the campaign ended in a siege, the basic course of combat was the same: maneuver, a direct clash between two armies in a limited geographic space (a field or a fortress), a moment of climax (the enemy retreats, the city walls are breached, a starved population decides it can't continue), and capitulation.
The center of gravity isn't always the enemy's armed forces, however. In "political" wars, the center of gravity can be the political will to continue paying the costs in blood and treasure of further combat. As the often-quoted Harry Summers observed about the Vietnam War, the United States won every battle, but it lost the war. The United States could have continued fighting the NVA and NLF indefinitely, but it chose not to. (Which, of course, led to decades of arguing over whether that decision was correct or not.) In Nicaragua, the core political base of the Somoza regime, the army and police forces, defected, paving the way for the later Sandinista victory.
The center of gravity in conventional wars also can vary somewhat. The ability to continue fighting may hinge on the strength of the army, navy, or air force, but what maintains strength? On the western front of WWI, generals on both sides focused on the number of relative number of troops killed each day. In the Nazi invasion of the Soviet Union, the Soviets needed the physical space to continue retreating until they could mobilize sufficiently to counterattack. In the Union campaigns against the Confederacy in 1864 through 1865, the emphasis had switched somewhat from winning a decisive set-piece battle to destroying the Southern economy.
The center of gravity may not be the same for both sides. For example, in the Ten Years War phase of the Peloponnesian War, particularly in the first three years, the center of gravity for Athens was its treasury, which determined how many years it could sustain Pericles' defensive strategy. Sparta's center of gravity, on the other hand, was its alliances: how well they held together; how much the war effort satisfied alliance politics for the Peloponnesians.
If the center of gravity does lie in the political or psychological realm, it's definitely harder to calculate the enemy's strength, or judge what's needed to strike effectively at this center of gravity. Defying the conventions of Maoist strategy, Castro switched the first two phases of a guerrilla campaign: the actual armed struggle in Cuba began before his movement built a large political base. He obviously guessed right about what he needed to do, but it wasn't as definite a calculation as, say, planning Operation DESERT STORM. Certainly, many military leaders have guessed wrong about the enemy's political center of gravity. Hitler, believing in the "terror from the air" theories of pre-war analysts like Duohet, thought that bombing British cities would force a British surrender. The Blitz stiffended British resistance, however, exactly the opposite of what Hitler had expected.
What determines the center of gravity? The status of military methods and technology, the war aims or grand strategies of the combatants, deliberate theater and operational decisions, and fate all play their parts. In the Chinese Civil War, the Communists originally tried to fight a conventional war. They paid for this mistake, but also learned that they could shift the emphasis from the balance of force to the balance of control. Pointing their energies at a different center of gravity not only led to the CCP's victory, but also inspired generations of imitators in other guerrilla wars.
PRACTICE
When I write postings on this blog, I often bemoan the non-discussion of the current wars in Iraq and Afghanistan, as well as the general US counterterrorism effort worldwide. Americans can't afford to be incurious about these conflicts. Nowhere is that statement more relevant than the question, What is the center of gravity in these wars?
To illustrate, answer the following question: To win the war in Iraq, the most important step is to...
- Kill as many of the enemy as possible.
- Secure areas that are home to people who might support or tolerate the enemy.
- Carry out large public works projects designed to win support.
- Remove a military presence that some group of people find offensive.
Don't worry, there's no 100% correct answer. Instead, the point of the exercise is to show the differences between how people might answer that question, and then this one: To win the global war against terrorist groups like al Qaeda, the most important step is to...
- Kill as many of the enemy as possible.
- Secure areas that are home to people who might support or tolerate the enemy.
- Carry out large public works projects designed to win support.
- Remove a military presence that some group of people find offensive.
I'm guessing that, whatever answer you picked the first time, you didn't pick the second. There's a strong case that the occupation itself in Iraq sustains the insurgency against the post-Baathist government, so a lot of you might have picked #4. However, the United States withdrew its forces from Saudi Arabia, but there are still many Islamists who want to kill Americans (including some Saudis). The United States might remove one terrorist talking point by withdrawing from Iraq, but that action, in and of itself, will have almost no direct effect on al Qaeda.
Obviously, the center of gravity is different in these two conflicts. But how often have you heard someone make that point? Or even present for discussion the four courses of action I just summarized?
Failing to ask these questions is worse than flying blind. It's tantamount to flying blind and without a destination.