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Ambrose to Palmer, 10 October, 1855, in United States, Office of Indian Affairs, Letters Received by the Office of Indian Affairs, 1824-1880, National Archives Microcopy 234, Roll 608 (excerpt), NADP Document D31.
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Office Indian Agent
Rogue River Valley O.T.
Oct 20th 1855.

Sir
      Since I informed you of existing hostilities in this valley, no important event has occurred not contained in that communication. I have learned reliably, that the Shasta Scotans, Grave Creeks, and many of the Umpqua and Cow Creeks, are concerned in those hostile misunderstandings and measures, the Shastas are beyond doubt the leading spirit of the whole expedition, Old chief John has managed to secure the assistance of all the above named tribes, together with the Klamaths, and all the surrounding tribes are concerned in this war. Not that there is a general combination of all those tribes to do this for there is [illegible] existing among some of these tribes, but they all have their animosity] against the white man. The Klamath Lake Indians on the East have been at war for two months last, and the murders which were committed on the Siskeyou Mountain was doubtless done for these on the south were the Klamath River, and Shasta Indians at war for sometime past. On the west are the Scotans, Grave Creeks and cow creeks who were greatly disaffected & here you will see it would require [...]