The Indians began to set fire to the dead grass.

The evidence

• “As was usual we learned, the Indians in the fall of 1837 began to set fire to the dead grass and the frequent fires here and there were a grand but somewhat frighful sight to us. It would seem sometimes as though the whole country for miles”

  1900-caswell-reminiscences/07-fort-atkinson-and-early-janesville.md, PDF pp. 3–27

  Caswell, Lucien Bonaparte. The Reminiscences of the Hon. L. B. Caswell. Written at Fort Atkinson, Wis., 1914–1916; four-column newspaper reprint, newspaper and date unidentified. University of Wisconsin-Madison Libraries.

  Grade A: Found on a page of one of our sources