Chief Joseph has made a speech, which it was about them surrendering to the enemies in the war. In more precise terms, Joseph is suggesting that he, and his tribe doesn't want to fight, as he and his people is now suffering as they don't have the required essentials due to the losses in the war.
In the passage, he is saying that,"I am tired of fighting. Our chiefs are killed, Looking Glass is dead, Ta Hool Hool Shute is dead. The old men are all dead..." as to state his losses. He is trying to show the enemies on what he and his people has lost through this speech, and so wants them to a feeling.
This speech is supported by Chief Joseph's use of pathos, and anaphora. For anaphora, he uses the word "dead" on the end of the sentences, showing on what he has, is now gone. By using these devices, he is able to show them that they don't want to fight anymore.
