Conversation so far:
What was significant about Kit Carson's third expedition?
In 1845, Kit Carson guided Frémont on their third and last expedition. They went to California and Oregon.
Why did Kit Carson and Frémont go on their third expedition?
Frémont made scientific plans, but the expedition appeared to be political in nature.
How was Kit Carson and Frémont's third expedition political in nature?
Frémont may have been working under secret government orders. Messages from Washington, DC made it clear that President Polk wanted California.
What did Kit Carson do when the third expedition with Frémont was complete?
Kit Carson took an axe and avenged the death of his friends by chopping away at a dead Indian's face. Frémont wrote, He knocked his head to pieces.“

Question: How were his friends killed?
Self-contained rewrite: How were Kit Caron's friends , who he took and axe and avenged the death of, killed on his third expedition?