In 1869, General Irvin McDowell, from the Union Army, was sent by President Abraham Lincoln to plan an offensive against the Confederate Army that would open their way towards Richmond, where the Confederate Congress would take place on July 20 in that year. The offensive would take place near Manassas Junction, Virginia.
General McDowell knew that many of his men were not ready to launch an offensive and asked for a postpone in order to schedule a training. However, the President ordered to launch the offensive without postponement. This resulted in a defeat against the Confederate forces, as these army's intelligence networks had already informed Confederate General Beauregard about the precarious situation of the Union Army.