Statistics for occurrence #1 of “Mr. Walker” in chapter 7.19 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: The Opening Battles. Volume 1.:

...commander-in-chief, and he (to command one of the wings) second in command, or General Beauregard-conclusive proof that the troops were not under his command. Two letters, from General Lee and Mr. Walker , Secretary of War, are cited as evidence that General Beauregard commanded. Those gentlemen were in a position to know if I relinquished the command or not. But I had this letter from General Lee: ...
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