Statistics for occurrence #1 of “Lieutenant W. W. Sanders” in chapter 3.9, page 147 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.:

...On April 14, 1861, the day after Sumter's surrender, the Federal Government received an offer of a volunteer regiment from Minnesota, and on April 29, the First Minnesota was mustered into service by Lieutenant W. W. Sanders , U. S. A. Under Colonel Willis A. Gorman, the regiment proceeded to Washington in June and, attached to Franklin's Brigade, Heintzelman's Division of McDowell's Army, at Bull Run gave an excellent ac...
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