dateline on August 26, 1861 patriotic lettersheet, "Death to Traitors" cannon and flag envelope postmarked "Chicago Ills Aug 26", franked with 1857 3c Dull red (26) and addressed to Preemption, Illinois, letter with interesting contents about camp life, cover ragged at left and with overall staining, still rare, Camp Webb was a temporary Union Civil War encampment located in the suburbs of Chicago