September 3-12; Sept. 13

The lower drawing is where the army was upon Col. Lyman's (TL) arrival by train.
"A" Drawing is the army placement on the 13th.
On Sept 2, TL was in Washington staying at Willard's awaiting the boat to Alexandria.  From Alexandria he boarded a train which took him to the vicinity of the HQ.  From the railroad the ride was about 2 1/2 miles on horseback.  There he reported in and was invited to mess with Gen. Meade, and Gen. Humphreys.