Statistics for occurrence #1 of “P. M. Back” in chapter 12 of John D. Billings, The history of the Tenth Massachusetts battery of light artillery in the war of the rebellion:

...ouse used as hospital (Harris House) near army headquarters. Lay there all day and night with large part of Second Corps. Monday, 16 Moved up across the road. Went to Stevens House awhile in P. M. Back again at night. Tuesday, ,17. To Stevens House again. Back again at night. On the move all night, and Wednesday, 18, brought up at Stevens House. Went into battery on the hill near th...
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