By spring 1864, the administration of Abraham Lincoln was in serious trouble, with mounting debt, low morale and eroding political support. As spring became summer, a force of Confederate troops led by Lieutenant General Jubal Anderson Early marched north through the Shenandoah Valley and crossed the Potomac as Washington, D.C., and Maryland lay nearly undefended. This Civil War history explores what could have been a decisive Confederate victory and the reasons Early's invasion of Maryland stalled.