General Buell immediately restored the mail facilities, which had so long been denied the people by the rebellion, and adopted every measure to ensure and restore confidence among the citizens. Many of them had fled their homes during the panic, the stores and places of business were closed, and the whole community were perfectly paralyzed during the week that had intervened between the fall of Fort Donelson and the occupation of the city. Eight days of terror afforded them a fearful illustration of lawlessness and violence: and when the Federal troops took possession, their sobriety, decorum and uprightness, amazed the people with the contrast. The loss of many of their relatives, the deep hostility that had been engendered in their breasts, and the doubts as to the ultimate restoration of the Federal authority, made the development of loyal sentiments a work of time and patience. The retreat of the national forces from Nashville, and the withdrawal of the protection of the Government, would be the death-warrant of any person committing himself too openly for the Union cause; and many citizens allowed these contending motives to restrain their welcome to the flag under which they had so long enjoyed peace, prosperity and repose. The government at Washington took an early opportunity to appoint a military governor for the State of Tennessee, in the person of Hon. ANDREW JOHNSON, a man who had long represented its people as Governor and United States Senator. Some of the ladies of Nashville were peculiarly ardent in their dislike of the Union occupation, and took especial pains to avoid or sneer at the glorious old flag which was directly hoisted in the most prominent parts of the town. Over the large gate at the Provost-Marshal’s splendid headquarters—Elliott’s female school—a Union flag was hoisted. A very ardent secesh lady, who wished to see Colonel Matthews, was about to pass through the gate, when looking up she beheld the proud flag streaming on the breeze. Starting back horror-struck, she held up her hands and exclaimed to the guard: “Dear! I can’t go under that dreadful Lincoln flag. Is there no other way for me to enter?” “Yes, madam,” promptly replied the soldier, and turning to his comrade, he said: “Here, orderly, bring out that rebel flag and lay it on the ground at the little gate, and let this lady walk over it!” The lady looked bewildered, and after hesitating a moment, concluded to bow her head to the flag which had so long protected her, and passed under it with submissive grace. FORT CLINCH AND FERNANDINA, FLA.