With Heaton's words, "the great Army of the Potomac has at last started," we get a sense of impatience, on the soldier's part, with Gen. George McClellan's well-known reluctance to send men into battle. The date of this letter coincides within the beginning of the Peninsula Campaign, which deployed over 121,000 Union soldiers. Perhaps Heaton's regiment, camped somewhere in Virginia, is about to meet up with this "offul Army down on the co[a]st it numbers 90 thousand men" as part of the Campaign. He notes some of the destruction left behind by retreating rebels, most notably the burned homes near Fairfax courthouse, supposedly where George and Martha Washington were married. (The home owned by Martha Custis, Washington's betrothed, was indeed burned in 1862 because of the war. This is believed to have been a likely site of the marriage in early January, 1759.) Other place names mentioned: Mannassas, Centerville.