Answer:
The Battle of Gettysburg!
Explanation:
The Battle of Gettysburg was fought July 1–3, 1863, during the American Civil War, in and around Gettysburg, Pennsylvania
The correct answer is C.
In fact the other options provided state the weaknesses that the Europeans encountered in their conflicts against the native Americans. They did not know the land, whose wilderness added extra dificulties for strangers, and in the case they needed reinforcements, the process of bringing them from Europe was long and costly.
But these weaknesses were rapidly outbalanced due to the huge superiority that the Europeans had in terms of weaponry if compared to the natives. They already knew gunpowder, while, natives Americans were still using bows and arrows. Moreover, the Europeans had properly organized armies, with its hierarchies, different units, experienced and skilled commanders, etc.
I'm sure the answer is there are no public documents. because if there was no public documents how would we be able to research and learn about it.