"armed expedition" is correct and commonly used in written English.
It refers to a military or armed mission or journey with a specific goal or purpose. It can also be used to describe a group of armed individuals who embark on such a journey. Example: "The president ordered an armed expedition to retrieve the hostages held by the enemy forces."
Furthermore, anyone who could read a newspaper knew that Burr was organizing some sort of armed expedition, and this certainly included President Jefferson, who met with Burr during one of his recruiting trips.
WASHINGTON, April 19 The State Department said today that no agency of the Govern ment had any knowledge of an armed expedition mounted on United States territory for an attack on Cuba.
Baranov led an armed expedition to retake Sitka by force in June 1804.
In Belfast in early November 1880, The Boycott Relief Fund was established to arrange an armed expedition to Lough Mask.
An outcome of this venture was a plan to send an armed expedition from the Dominican Republic to invade the island.
After signing a letter that could serve as proof of his intentions of becoming a United States citizen (mainly to prevent his arrest elsewhere) Betances then returned to the Dominican Republic in September 1867, where he attempted to organize an armed expedition that was to invade Puerto Rico.
I finally found it in the Royal Signals Museum at Blandford Forum, and so I mounted an expedition, armed with Pantone swatches, portable colour-measuring apparatus, scalpals.
The following year Francisco Vázquez de Coronado led a large well-armed expedition to Arizona in an effort to claim for Spain what is known today as the American Southwest.
The American minister to Japan, eager to "show the flag" in solidarity with the European-led expedition, had explicitly chartered and armed the commercial steamer Ta-Kiang to take part in the September actions at Shimonoseki.
Meanwhile, on the coast of Somalia, armed ganglords chivvy the locals into a piracy expedition.
As the expedition ventured further into this geological wilderness, armed with my notebook and camera, I snapped and scribbled like I was measuring up the canyon for a new suit.
