THE MOUND CITY MASSACRE in February 1813 set off THE CREEK WAR.

Here's an 1883 article about it:
http://www.illinoishistory.com/moundcitymassacre.html

Here's an article about Gillum Ferguson's new book on ILLINOIS IN THE WAR OF 1812
 http://www.dailyregister.com/article/20120423/NEWS/304239929

Here's a google search that shows what Gillum Feguson wrote about THE CACHE RIVER MASSACRE (also known as THE MOUND CITY MASSACRE)
http://books.google.com/books?id=NUKA0OjZGL4C&pg=PA268&lpg=PA268&dq=%22illinois+in+the+war+of+1812%22+ferguson+cache+river+massacre&source=bl&ots=hgbKEA90u5&sig=4-SBIUH_WvAdPQF54usDrswkN1c&hl=en&sa=X&ei=HYPDUK5pp6zQAamEgVg&ved=0CDYQ6AEwAQ#v=onepage&q=%22illinois%20in%20the%20war%20of%201812%22%20ferguson%20cache%20river%20massacre&f=false