Staff Sgt. Robert Bales, the Army soldier who is set to be charged in the mass murder of 16 Afghan civilian men, women and children, spent the weekend in pretrial isolation as military prosecutors prepared a case that may carry the death penalty. Staff Sgt. Bales, 38 years old, was brought to the military prison at Fort Leavenworth, Kan., late Friday to await the charges, which military officials said could come sometime this week. Meanwhile, a Seattle-based criminal attorney retained to defend Staff Sgt. Bales traveled to Kansas Sunday and planned to meet Monday with the soldier. Staff Sgt. Bales...