The March–April 2005 online Field Artillery magazine has confirmed the use of WP (white phosphorus) in so-called "shake 'n bake" attacks: ""WP 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 explosives (HE). We fired "shake and bake" missions at the insurgents, using WP to flush them out and HE to take them out."" [P.26]