I believe that the best answer for this question is the Nez Perce War. The War broke out when the U.S. Army pursued 750 Nez Perce, led by Chief Joseph, who were fleeing away from Idaho and towards freedom. The Nez Perce outfought their opponents, but eventually, Joseph formally surrendered. After the war ended, the Nez Perce were shuttled to prisoner of war camps for eight months. Chief Joseph went to see the President to plead his case. Hope this helps.
I think the author established anger as the mood in the excerpt. It is noticeable how the character is furious (for whatever reason) and shows her emotions by tearing that thin handkerchief into ribbons.
Keats chose a sonnet in response to Chapman's Homer because it was his favorite poetic style at the time. Writing sonnets allowed him to express all the emotional power so natural to the romantic poets he derived inspiration from,
