In the Sangamon County Circuit Court, Lincoln & Herndon represent the plaintiff Benjamin F. Irwin in the case of Irwin v. Willis. Irwin is suing William Willis for some money that Willis owes to Irwin. The Court swears in a jury which hears the "evidence and arguments of counsel." The jury finds in favor of Irwin and assesses $349 in damages. Judgment, 12 November 1858, Irwin v. Willis, Record R, 370; Judgment Docket, 12 November 1858, Irwin v. Willis, Judgment Docket E, fol. 316, both in Sangamon County Circuit Court, Illinois Regional Archives Depository, University of Illinois at Springfield, Springfield, IL .