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On receiving the news of the attack by Indians on the Pony Express riders, a large number of Senators and Representatives addressed a note to the Secretary of War, asking the intervention of the army. Mr. FLOYD immediately dispatched by telegraph the following message to Col. SMITH, Commanding Camp Floyd, to send immediately a sufficient force to protect and keep open the route for mail immigrants between Camp Floyd and Carson Valley. This dispatch will leave St. Joseph on Saturday evening, and in eight days the troops will be on their route. Mr. RUSSELL, President of the Express Company, has no fear that the express mail-bag is lost. Two trips ago a rider was killed, and yet the mail was saved. Mr. R. has required the official report of the local agent whether the murdered rider left any family,  as the Company have determined to provide for the families of those lost in their service.