Statistics for occurrence #1 of “General D. M. Frost” in chapter 4.10 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 1: The Opening Battles.:

...e outbreak of the War. By order of Governor Jackson, a Camp had been formed in the western suburbs of the city for drilling the militia. It was named in honor of the Governor, and was in command of General D. M. Frost . Captain Nathaniel Lyon was in command of the United States troops at the Arsenal in St. Louis. Lyon, on May 10th, marched nearly five thousand strong, toward Camp Jackson, surrounded it, planted b...
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