ANSWER: WEDNESDAY 19 MARCH 2003
Pre-Invasion attacks reportedly began around 4pm EST, with the first strikes of the Liberation/Disarmanent mission beginning at 9:35 as reported from Baghdad, and reported by the WH at 9:45pm EST. The Pentagon gave the official time of initiation of activities as 9:54pm EST.
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Godspeed in the mission & God Bless ALL the US & UK troops!