IN THE NEWS
The recent flurry of questions, announcements, and more questions about the US military's use of white phosphorous munitions in Iraq (and in Fallujah in particular) clarified some important points, and managed to confuse quite a few more. Here's some background on this weapon and why it's being used--again.
As by know you've probably heard, the US Army and Marines used white phosphorous (WP) grenades extensively during World War II. The weapon proved effective enough to remain in the American infantry's arsenal during the Korean and Vietnam wars. At the time, the "effectiveness" of white phosphorous (or "Willy Peter," as the GIs nicknamed it) was well understood and respected. WP burns at a high temperature for a limited period and creates a great deal of smoke, giving it both an offensive and defensive purpose.
The offensive purpose is, of course, what has received the most attention during the last two weeks. WP helped solve a tactical problem, how to kill enemy troops in fortified positions, such as stone buildings and concrete bunkers. Small arms fire wasn't sufficient, particularly since a soldier trying to fire around the corner of a building or through the slit in the face of a bunker exposed himself to fire from the enemy, hidden behind the protective shield of concrete and steel. Fragmentation grenades weren't always effective, particularly in the topography of a building, either intact or reduced to rubble. Too many obstructions blocked the trajectory of the grenade fragments, an acute problem when an infantryman might not know where in the pile of rubble or the shadowy corners of a building the enemy was hiding. Artillery and air strikes, of course, could pulverize a fortified position, but it was too unpredictable. The munitions might not land on target, and the artillery or aircraft might not even be available in the first place. Even when a bomb or shell hit the building exactly where it was supposed to, that didn't ensure that it would break conveniently break open or collapse in the manner intended.
Therefore, WP munitions became a necessary part of the American GIs equipment, to deal with well-entrenched defenders in situations like these. The WP grenades, when detonated, would burn hot enough to quickly kill enemy soldiers in a particularly ghastly way, or make them afraid they might be killed in another second or two. The smoke often made the close confines of the fortified position unbearable, and it often disoriented soldiers to the point where they were unsure which direction an attack might be coming. Not surprisingly, American soldiers could induce panic among German and Japanese soldiers with only a few WP grenades--often enough to get the enemy to retreat or surrender.
The United States and other combatants used other weapons, such as flamethrowers, in these situations. However, WP still had an important advantage over many of these alternatives: smoke that obscured the enemy's vision, allowing American troops to advance through open ground that otherwise might be deadly to cross. WP therefore complemented the standard (and more widely available) smoke grenades, which did not have the same ability to burn and suffocate defenders. Unlike flamethrowers, WP did not force troops equipped with them to carry a large tank of highly flammable material in places where a stray bullet or shell fragment could rupture the container. Unlike artillery and close air support, WP was available when and where the infantry needed it, and it was reasonably accurate when thrown.
However effective WP may have been, from Vietnam to Iraq, there was no compelling reason to use it. With minor exceptions like Somalia, the wars that the United States fought didn't pose the tactical challenges that required WP.
However, that didn't mean that these battlefield scenarios passed out of the US military's institutional memory. Far from it: even before the invasion of Iraq, US military planners understood that the increasing urbanization of the world meant that, on average, US troops would be fighting in cities more often than they had in past decades. "Urban warfare" became the shorthand for the operational, tactical, and technical challenges in future wars.
Not surprisingly, the US military has been regularly experimenting with new and old weapons with urban warfare in mind. Some of these have been deadly, such as the thermobaric variant of the Marines' Shoulder-Mounted Assault Weapon (SMAW). The SMAW not only can create a shockwave capable of killing and wounding the enemy, but also burns over a wide radius. Some of the new tools of urban warfare are quite unlike the SMAW. The recent rage for non-lethal weapons arises from the same concerns that gave birth to the SMAW: how to fight in urban centers. These weapons, designed to entangle, disorient, stun, or blind the enemy, are designed to avoid the sort of civilian casualties inevitable when fighting in densely populated areas. Clearly, the US military has wanted the right tool for the right job: WP, thermobaric weapons, and equally deadly tools when the risk to civilians is lower; non-lethal weapons when enemy soldiers are entrenched among innocent bystanders.
Clearly, WP is right on the boundary of acceptability drawn at the end of World War I, when the world as a whole decided that chemical and biological weapons should never again be used. There are only two differences between WP and mustard gas worth mentioning: the range of deployment and the long-term effects.
Artillery gunners tried to disperse a chemical agent that killed people in a horrible way over as wide an area of the enemy's trench line as possible. In contrast, soldiers tossed WP grenades with more discretion and accuracy--and far fewer casualties, both intended and inflicted. The size of the chemical arsenals themselves created a problem, how to safely identify and dispose of stockpiles after the war ended.
WP also did not have the same long-term effects as mustard gas, chlorine gas, and their ilk--and for far fewer people, given the narrower range of deployment. The unfortunates who survived WWI chemical attacks often lived with life-long damge to their their lungs, skin, eyes, nerves, and other vital parts of their bodies. The legacy of chemical munitions, which most Europeans could see in the ravaged bodies of friends, co-workers, and family members, reinforced the taboo against their use.
I leave it up to you decide whether these are distinctions without a difference, or acceptable limits to the usage of a weapon, WP, designed with the same purpose as a bullet or bomb. Whatever your conclusion, you can probably see how hyperbolic some recent statements about WP have been. Most notably, white phosphorous is not a weapon of mass destruction. Real WMDs, such as nuclear weapons and biological agents, are designed to kill as many enemy soldiers and civilians. In fact, one of the defining features of WMDs is their express design to inflict mass casualties, and by extension, mass terror. The center of gravity for these strategic weapons is normally the political will of the enemy population, or even the existence of a functioning economy or government. The intended target of WP, a battlefield weapon, is the enemy soldier.
At the same time, there are extremely disturbing aspects of the Pentagon's admission that it used WP in Fallujah. US commanders knew that many civilians were trapped in Fallujah. In that cause, who exactly authorized the use of WP, and under what guidelines? How many civilians died from WP munitions? Is WP part of some official tactical doctrine that includes safeguards to prevent civilian casualties, or is this another hurried response to a conflict that has spiraled out of control? And why, given the obvious sensitivity of the issue, did the Pentagon and the White House first try to deny something that, later, they would inevitably have to confirm? (Actually, the answer to that last question may be, Force of habit, given how many times during the Iraq War the Bush Administration has been dragged down the same road from denial to admission.)
The most important factor for deciding whether the use of WP was justified or not may be the nature of the conflict itself--the distinction between America's wars that does make an enormous difference. In WWII, there was no "hearts and minds" struggle. Nations conquered by Nazi Germany were eager to be liberated, and their citizens understood the grim cost that they would have to pay to be freed. When Allied bombers attacked German U-boat pens on the French coast, French civilians died. When Allied troops fought for control of cities like Caen, Salerno, and Arnhem, innocent bystanders often fell to stray bullets and bombs. However tragic these casualties were, they were understood as the unintended consequence of attacks designed to defeat the German military--even when it meant attacking factories, rail lines, and other economic targets.
Iraq is, of course, not the same. Defeating insurgents requires more than just military skill. The normal formulations for finding, fixing, and finishing enemy soldiers need to be modified, and perhaps at some levels of strategy, rejected altogether. Winning temporary military control of a building, a street, and an entire city may in the long run be meaningless, no matter how hard the fight to win them was. Aside from moral implications, the political backlash, in Iraq or in the United States, is the proper measure of whether use of WP or any other weapon was justified.
Guerrillas and terrorists often try to goad their enemies into rash, counterproductive responses. The use of white phosphorous munitions in densely-populated Fallujah just may turn out to be the most recent example of this strategy successfully applied.