Why was mcdowell slow to march against bull run

I think General Irvin McDowell was slow when marching at Bull Run (Manassas) because he was commanding an army composed largely of amateur soldiers that wouldn't focus.

Explanation:

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).

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