The regiment moved from Fort Vancouver by boat, March 25, 1856, and landed at the small town called the Dalles, below the mouth of the Des Chutes River at the eastern base of the Cascade Range, and just above where the Columbia River enters those mountains.  This rendezvous was to be the immediate point of departure, and all the troops composing the expedition were concentrated there.

On the morning of March 26 the movement began, but the column had only reached Five Mile Creek when the Yakimas, joined by many young warriors-free lances from other tribes, made a sudden and unexpected attack at the Cascades of the Columbia, midway between Vancouver and the Dalles, killed several citizens, women and children, and took possession of the Portage by besieging the settlers in their cabins at the Upper Cascades, and those who sought shelter at the Middle Cascades in the old military block-house, which had been built some years before as a place of refuge under just such circumstances.  These points held out, and were not captured, but the landing at the Lower Cascades fell completely into the hands of the savages.  Straggling settlers from the Lower Cascades made their way down to Fort Vancouver, distant about thirty-six miles, which they reached that night; and communicated the condition of affairs.  As the necessity for early relief to the settlers and the re-establishment of communication with the Dalles were apparent, all the force that could be spared was ordered out, and in consequence I immediately received directions to go with my detachment of dragoons, numbering about forty effective men, to the relief of the middle blockhouse, which really meant to retake the Cascades.  I got ready at once, and believing that a piece of artillery would be of service to me, asked for one, but as there proved to be no guns at the post, I should have been obliged to proceed without one had it not been that the regular steamer from San Francisco to Portland was lying at the Vancouver dock unloading military supplies, and the commander, Captain Dall, supplied me with the steamer’s small iron cannon, mounted on a wooden platform, which he used in firing salutes at different ports on the arrival and departure of the vessel.  Finding at the arsenal a supply of solid shot that would fit the gun, I had it put upon the steamboat Belle, employed to carry my command to the scene of operations, and started up the Columbia River at 2 A.M. on the morning of the 27th.  We reached the Lower Cascades early in the day, where, selecting a favorable place for the purpose, I disembarked my men and gun on the north bank of the river, so that I could send back the steamboat to bring up any volunteer assistance that in the mean time might have been collected at Vancouver.

The Columbia River was very high at the time, and the water had backed up into the slough about the foot of the Lower Cascades to such a degree that it left me only a narrow neck of firm ground to advance over toward the point occupied by the Indians.  On this neck of land the hostiles had taken position, as I soon learned by frequent shots, loud shouting, and much blustering; they, by the most exasperating yells and indecent exhibitions, daring me to the contest.