I have not been to the site, but I am going to guess from your comments that there is a combination of poor disposition and poor choice of ground, likely conferring excellent vantage points to the Native Americans while denying it to themselves and also leaving flanks unanchored (I don't know if Custer and his men set up a 360 degree perimeter early on or not).
I have joined Border Reiver in criticizing Custer for engaging without the proper reconnaissance. I stand by that. Yet I am willing to concede that once engaged he fought well for the circumstances. He remained aggressive and tried to implement the tactics that had worked before, i.e., capture the non-combatants to force the warriors to capitulate.
Yes, that's it. Custer never formed a 360 degree perimeter. For whatever reason, Custer was unable to form his five companies into a unified defensive position. If you stand at Custer Hill and look towards Calhoun Hill, it's appalling how far away it is: 700 yards (640 m). Every time I look at it I can't believe how far apart the positions are.
So Companies E and F were deployed somewhere near Custer Hill. Company L was on Calhoun Hill. This was the only company that died in a clear defensive position with both officers in place behind their men. Company C was found on a ridge towards the river, 400 yards from Calhoun, and completely out of supporting distance of the others. Keogh's Company I was found in a line on the east part of the ridge starting near Calhoun's Company and extending towards Battle Ridge. It was not a position a company would take for defense so it's believed to represent soldiers shot down while fleeing towards Custer Hill.
In contrast, Reno and Benteen were able to form their 7 companies into a single circular line making the best use of the meager cover available. It wasn't an inherently strong position because it included a wide swale, but they made the best of it by putting the horses and supplies in the middle.
It's true that Reno and Benteen had more men (approx. 340 vs Custer's 210) and also had the advantage of the spare ammunition in the packs. So maybe that was the deciding factor. But I think if you look how dispersed Custer's position was, there was no way for them to make a long stand against the numbers he faced.
I'll add some points later.
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