McDowell planned to move on Manassas Junction July ninth, but was delayed for more than a week.

VOA: special.2009.08.27

McDowell was worried that another large Confederate force west of Manassas Junction might join Beauregard's army.

VOA: special.2009.08.27

They were to prepare for a major battle at a place called Manassas Junction,or Bull Run.

VOA: special.2009.08.20