Edwin V. Sumner to Island for the present, August 20, 1861

Capt H. M. BLACK,

Ninth T nfantry, Comdy. Detach. of troops under orders Jor Fort Cascades, Wash, Ter., Fort Vancouver, Wash. Ter.: CAPTAIN: The report which I have received from the Cascades renders it highly probable that an attempt is being made by some of the

Indian chiefs at that place to engage in hostilities against the whites. The chiefs Blan-a-har and Tim-e-tos are said to be the prime movers. The first-named should properly have been executed in 56. On reaching the Cascades acquaint yourself with the condition of affairs and exercise your judgment how to act. If you are satisfied that these chiefs or any Indians in that quarter have already committed any hostile acts, or have by word or deed been endeavoring to persuade the Indians to commit aggressions, seize them ail, and execute summary punishment on the guilty. Captain Van Voast will be at the Cascades on Friday morning and act under your orders. Let me know by every steamer the state of affairs at the Cascades. It is probable that before the end of the month I shall withdraw yourself and command, leaving Captain Van Voast in charge. Lieutenant Wildrick will turn over to you a box of 15 rifles and 500 cartridges, which you can place in the hands of Colonel Ruckel and Mr. Olmstead for defense of the depot of the Oregon Steam Navigation Company, those gentlemen receipting for the same.

Very respectfully, your obedient servant,