Why did mcdowell want to seize manassas?

General George B. McDowell sought to seize Manassas during the Civil War to disrupt the Confederate supply lines and prevent them from launching further offensives. Capturing Manassas would also allow Union forces to secure a strategic position closer to the Confederate capital of Richmond, Virginia. Additionally, a victory at Manassas was seen as crucial for boosting Union morale and demonstrating military effectiveness. Ultimately, the goal was to gain control of Virginia and bring a swift end to the conflict.