Statistics for occurrence #1 of “Brig.-Gen. William F. Barry” in chapter 7 of Elias Nason, McClellan's Own Story: the war for the union, the soldiers who fought it, the civilians who directed it, and his relations to them.:

...y Brig.-Gen. Casey, who continued in charge of the newly arriving regiments until the Army of the Potomac departed for the Peninsula, in March, 1862. The newly arriving artillery troops reported to Brig.-Gen. William F. Barry , the chief of artillery, and the cavalry to Brig.-Gen. George Stoneman, the chief of cavalry, and were also retained on the Maryland side until their equipment and armament were essentially completed...
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