The army moved to the stop the advanced on their capital

The correct answer to this open question is the following.

The Union Army moved to stop the advanced on their capital.

We are referring to the Civil War years (April 1861-April 1865), in a moment when General Robert E. Lee, leader of the Confederate Army advanced over strategical Union's positions and tried to move through the Potomac River to capture Washington D.C., the capital city of the Union. The battle was a bloody one and both armies lost many men. In the end, the Union's Army of the Potomac impeded the Confederates to move on and frustrated its intentions to invade Washington.

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