Col. Ed. L. Bailey of the 2nd New Hampshire provides important details as to the 68th's movements (Bachelder Papers, 2:846) after the 2nd New Hampshire had advanced through the Peach Orchard (facing southerly):
"came the 68th Pa. Regt. forming parallel to the Emmitsburg road perpendicular to my front, its left resting near my right flank."
Under a brutal artillery fire, the 21st Mississippi was approaching:
"As this advance was made the enemies [sic] batteries showered upon us a perfect hail of metal, which had the most fatal effect upon the 68th Pa. Regt., as that was from its position more exposed than was my own command, although my right suffered much. The 68th Regt. endured the fire for some minutes was obliged to retire from its exposed position ..."
This forced Bailey to make two changes of front to rear on his left company so that he was facing westward to check the advance of the 21st Mississippi, aided by the 3rd Maine on his left. Then he recalled:
"the 68th Regt. charging on my right flank to get up to the crest of the hill; but it did not succeed, though most gallantly endeavoring, and was twenty paces or more behind the parallel of my line."
So the 68th, although initially driven back, had enough fight left in it to make one more charge.
This quite specific description informed the placement of 2 NH and 68 PA on my attached draft map. As for the 141st, Madill links his regiment's movements with that of the 68th Pennsylvania, so he must be close by, although one source (Our Boys in Blue, by Clement F. Heverly) puts the regiment "north of the Peach Orchard," meaning on the north side of the Wheatfield road, which I think likely since the 141st did not come to Bailey's attention, or vice versa. Hence my positioning of these regiments on the map.