Statistics for occurrence #1 of “Wm. Regan” in year 1864, month April of Rebellion Record: a Diary of American Events, Diary from December 17, 1860 - April 30, 1864:

..., a caisson of Croswell's Illinois battery exploded, killing instantly privates Jacob Englehart, John Olsin, Wm. Humphrey, David Roach, Wm. Mattison, and Horace Allen, and wounding George Barnes, and Wm. Regan . Several of the bodies of the killed were blown to atoms, and portions were found five hundred feet distant. The horses attached to the caisson were killed. The railroad depot was badly shattered...
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