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US Army Admits Use of White Phosphorus as Weapon
..."WP [i.e., white phosphorus rounds] proved to be an effective and versatile munition. We used it for screening missions at two breeches and, later in the fight, as a potent psychological weapon against the insurgents in trench lines and spider holes when we could not get effects on them with HE. We fired 'shake and bake' missions at the insurgents, using WP to flush them out and HE to take them out."...

...there is no way you can use white phosphorus like that without forming a deadly chemical cloud that kills everything within a tenth of a mile in all directions from where it hits. Obviously, the effect of such deadly clouds weren't just psychological in nature....