Not only did the Confederate troops retire on the approach of the Union troops, but a large number of families and single citizens left at the same time. Indeed, for several days previous to the coming of the Union troops, it was well known in Alexandria that they were coming, and many of its citizens, some of whom owned farms in other parts of Virginia, some plantations in other parts of the South, and others who had friends and relatives in other parts of the State, or in other parts of the South, had all quietly left for their respective farm-homes, plantations, or friends. Some who could not leave thus suddenly went as soon as they could thereafter, so that, before a Union line had been fully established beyond Alexandria, probably two-thirds of its citizens had left, leaving only about ten thousand out of a previous population of about thirty thousand. Immediately thereafter, however, the Union forces commenced to establish camps at points beyond, yet not far from, Alexandria. Near the Seminary buildings, only a few miles from the city, a considerable number of troops were encamped; while, at Malvern Hills, at Edsall's farm, at or near Fall's Church, and at many other points, regiments, brigades, or whole divisions were located. As a consequence of this, notwithstanding Alexandria had been so largely abandoned by its own citizens, its streets were more thronged with citizens and soldiers combined, its drinking saloons were more frequented, and there was more of bustle and confusion generally in the city during the summer, fall, and winter of 1861 than there had ever been in any past period of its history. With the hasty leaving of the leading citizens of Alexandria had gone whatever it had possessed of municipal, county, or State government. The mayor and members of the city council had fled; all the State and county judges had fled; the county clerk, the surrogate, and every other county officer had fled; nor was there a single justice of the peace, a single constable, or a single police-officer--or, at least, not one who declared himself as such--left in the city. There was no formal announcement of the establishing of martial law within the city limits, but its possession by Union troops made it virtually so from the moment they took possession.