Statistics for occurrence #1 of “Colonel Mason” in chapter 8 of Colonel William Preston Johnston, The Life of General Albert Sidney Johnston : His Service in the Armies of the United States, the Republic of Texas, and the Confederate States.:

... undoubted evidence. This secret league against the Texans seems to have existed at least as early as 1835, and to have continued unbroken, The United States Government received information from Colonel Mason , at Fort Leavenworth, in July, 1838, confirmed by General Gaines, that the Cherokees were arranging for a council of all the tribes on the frontier, preparatory to striking a simultaneous blow upon t...
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