He was one of the first men to join the expedition.
It was one of the reasons he had decided to join the expedition to Earth.
"Not in terms of their ability to decide whether to Join the expedition."
His family has had no word from him since he stayed behind to join your expedition.
It is unclear how he came to join the expedition.
I heard this morning that they were expecting you to join the expedition.
Her chance of joining my expedition would have dropped to zero.
"How about you guys joining the expedition, all expenses paid?"
The steamer in question however did not join the expedition.
He may have been a surveyor before joining the expedition.