Joshua Chamberlain's Medal of Honor discovered at a church sale

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I was surprised last month at the talk on Gettysburg Revisited that Dr. Gottfried made at Surratt House to hear him say that he thought Chamberlain gets more credit in history for his actions at Gettysburg than deserved. He mentioned another officer who he felt did as much or more than Chamberlain in that crucial move (was it around Little Round Top?), but I cannot remember who that officer was.

I readily admit to not knowing about or appreciating military strategy and whose right flank out-flanked whose left flank, so I have no intention of reading the battle statistics for Gettysburg in order to find out who that officer was. Who is our Gettysburg expert on this forum?