Statistics for occurrence #1 of “Penn.” in chapter 35 of Elias Nason, McClellan's Own Story: the war for the union, the soldiers who fought it, the civilians who directed it, and his relations to them.:

...of Gen. Mansfield (the 12th) during the night, and hold his own (the 2d) corps ready to cross early the next morning. On reaching the vicinity of the enemy's left a sharp contest commenced with the Penn. ylvania reserves, the advance of Gen. Hooker's corps, near the house of D. Miller. The enemy was driven from the strip of woods where he was first met. The firing lasted until after dark, when Gen. ...
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