... General: Agreeably to your orders, I started from Gainesville on the morning of the eighth instant, to Fredericksburgh, to ascertain the force of the enemy at that place, and then to examine the Acquia Creek and Fredericksburgh Railroad on the return. I left Gainesville with sixty men of the First Indiana cavalry--Gen. Sigel's body-guard — and went to Bristow Station to obtain an additional force...