Final answer:
Tecumseh, a Shawnee war chief, was the "friendly chief" who sought to unite the Native American tribes to prevent fighting among themselves and to resist American expansion. He, along with his brother Tenskwatawa, led the efforts to form a confederation of tribes known as the Western Confederacy.
Step-by-step explanation:
The "friendly chief" who begged the Indians not to fight each other was Tecumseh, a Shawnee war chief, who is well known for his efforts to unite the Native American tribes against the encroachment of American settlers. Tecumseh and his brother Tenskwatawa, known as The Prophet, opposed American expansion and tried to form a confederation of tribes to resist the loss of their lands.
An example of the chiefs' plea for peace is reflected in the speech by Chief Joseph of the Nez Perce tribe in 1877, although this occurred later and in a different context than Tecumseh's efforts. Chief Joseph expressed his desire for peace, stating, "From where the sun now stands I will fight no more forever."