Warren Wilcox enlisted at Port Byron, Illinois on September 5 1861 as a private. On September 26 1861 Warren enlisted with company "M" of the 4th Illinois, there he stayed until his 3 year enlistment was up and Mustered Out November 3 1864

Here is Warren Wilcox pension form, it list no state where issued, it show him being diabled on October 22 1878