Statistics for occurrence #1 of “Pettis counties” in year 1861, month November, day 26 of Rebellion Record: a Diary of American Events, Diary from December 17, 1860 - April 30, 1864:

...e evidence on which the arrests were made.--(Doc. 194.) Col. Jennison issued a proclamation to-day to the people in arms against the United States Government in Jackson, Johnson, Lafayette, and Pettis counties , Mo., stating that all who would deliver up their arms, and perform their duties as loyal citizens, would not be held responsible for past acts, and would secure the protection of their lives and pro...
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