I think what he actually meant was the
27th Indiana. Hard, I know, to keep track of Regimental numbers. Gets me all the time. You're right. The 20th Indiana is in the Rose Field near the Wheat Field/Devli's Den. But the 27th is on Culp's Hill near Spangler's Spring.
They and the 2nd Massachusetts had a rough go of it.
I'm no scholar of this, but my Great Grandfather was a drummer in the 13th New Jersey Volunteers. In the same Brigade as the 27th Indiana and 2nd Massachusetts. So I've become a secondary follower of their exploits as well.
Which is why I'm particularly interested in the Z. Taney house. There is a book,
"Reminiscences of the War, Comprising a Detailed Account of the Experiences of the Thirteenth Regiment New Jersey Volunteers In Camp, On The March, and In Battle By Samuel Toombs With the Personal Recollections of The Author Published August, 1878"
(They just don't title books like that anymore, do they?)
A quote from the book concerning their experiences at Gettysburg:
I would like to go see that site.
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Edit:
Oops, my bad. He did mention the 17th Maine. So he did mean the 20th Indiana at the south end of the battlefield.