Conversation so far:
What was the Third Expedition?
In 1845, Carson guided Fremont on their third and last expedition.
What did they do on this expedition?
They went to California and Oregon.
What did they do in California and Oregon?
Once in California, Fremont started to rouse the American settlers into a patriotic fever.
How did he rouse them into a patriotic fever?
CANNOTANSWER.
What else did he do in California?
The party moved up along the Sacramento River, continuing to kill Indians as they went, then camped near Klamath Lake.

Question: What did they do when they got to Klamath Lake?
Self-contained rewrite: What did Kit Carson and Fremont do when they got to Klamath Lake?