Conversation so far:
What was the relation between Thomas Mitchell and Fourth expedtition?
Mitchell's fourth expedition was into Queensland in 1845-46.
He was convinced that a significant river must flow north-west into the Gulf of Carpentaria.
Where did the fourth expedition take place?
Mitchell started from Boree (Buree in Mitchell's journal) with a large party including Edmund Kennedy as second in command.

Question: Which other people were there with him?
Self-contained rewrite: Which other people were on the fourth expedition with Thomas Mitchell?