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

... corps were consolidated and called the First army corps. Major-General J. Hooker was assigned to command. Major-General Gordon Granger was relieved from the command of the Fourth army corps, and Major-General O. O. Howard was assigned in his stead. Major-General Schofield was assigned to the command of the Twenty-third army corps. Major-General Slocum would report to Major-General Sherman, commanding the divis...
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