Joseph Howland writes from Camp near Centreville.
July 20th.
We march at 6 p. m., and there will be a great battle within twenty-four hours unless the rebels retreat. Our brigade takes the advance on the left wing. We can see the enemy from a high hill near here concentrating their troops. Our pickets were firing all night, and we slept on our arms. I am well, though I feel the want of sleep and the constant anxiety. We are all in good heart, officers and men.
