The phrase "the expedition" is correct and usable in written English.
You can use it when referring to either a planned or completed journey or journey for a specific purpose. For example, "The expedition set out to find a cure for the disease."
Exact(60)
Tells about the expedition.
Describes the expedition.
Then the expedition really began.
WHEN did the expedition sail?
The planner of the expedition was Capt.
Carrington took charge of the expedition himself.
Only four men survived the expedition.
Reports from the expedition are at baiji.org/.org/
Tells what they ate on the expedition.
Mr. Franklin joins in the expedition.
One solution the expedition considered was amphetamines.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com