Statistics for occurrence #1 of “vice Dr. E. C. Walker” in chapter 9 of Isaac O. Best, History of the 121st New York State Infantry:

... captured. Two changes were made in the staff of the regiment during June. Chaplain Sage resigned and was honorably discharged and Dr. John 0. Slocum was commissioned and assigned to the 121st, vice Dr. E. C. Walker resigned. General Meade has been considerably criticized for not renewing the battle on the repulse of Pickett on the ground that the Sixth Corps had come up and had not been engaged in the battle,...
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