The quote was from the diary of Samuel Pickens of the 5th Alabama Infantry Regiment.

Much of his diary has been published in "Voices of Company D - Diaries of the Greensboro Guards, Fifth Alabama Infantry Regiment, Army of Northern Virginia" edited by G. Ward Hubbs.

I believe this book is still in print. The entry can be found on page 210.

A transcription of the diary is held at the University of Alabama - Hoole Special Collections Library.