The bloodiest day in U.S. military history occurred on Sept. 17, 1862, when Union armies and Confederate forces clashed at Antietam in Maryland during the Civil War. By the end of that day 26,000 men were dead, wounded, or missing. Over the years, more than 1.3 million Americans have died as casualties of warfare. But for all the horrors of war, there is nothing that compares with the tragedy that awaits those who choose hell over heaven. Spiritual warfare is far more costly if one sides with the forces of evil.