Jacob Willis, son of Thomas Jr served as PVT.and John Willis served as 2nd. Lt. in Capt.Harrison Wilson's Co in 1st.Regt. of 1st.Brig. of the Mounted Volunteers in Black Hawk War 1831-1832 out of Gallatin Co Il.Jacob had died before 1840,wife Mary Ann Willis married John Willamson in 1840.