A nation mourned him long—has not yet forgotten him, and green will ever be the laurel she entwines around the name of the boy-martyr of Alexandria! “Remember Ellsworth” became a watchword with the volunteers, who pledged themselves to avenge his death, and well they redeemed it. His life was stainless and loyal—his death, sealed with his blood the holy bond of his noble faith. When Lincoln saw this young man lying in his coffin, it is said that he wept over him. It was the first shock and horror of war brought home to the chief magistrate. Alas! if he has wept for all the brave that have since fallen, his days and nights must have been given up to tears. Alexandria and its neighborhood were occupied by the Federal troops, and a company of Virginia cavalry were captured; after a detention of some days they were released upon taking the oath of allegiance to the United States. Intrenchments were thrown up around Alexandria, and upon Arlington Heights, which commanded a portion of the capital. Bodies of troops were pushed forward toward Manassas Junction, with the object of interrupting the communication between Richmond and Harper’s Ferry. A detachment took possession of Arlington, the old Curtis Mansion, which had been deserted by its owner, General Lee, when he gave up his flag and took sides with its enemies. It is said that General Scott held this officer in such high appreciation that he offered him the chance of any position under himself in the Union army. When the letter reached Lee, containing this noble proposition, he was sitting with his family at Arlington. He read the letter in silence, and laying it on the table, covered his face with one hand. When he looked up traces of tears were in his eyes, and he said in a broken voice, “What am I to do? If I take up arms for the Union it must be to turn them on my native State, my own neighbors, dear relations. If I do not, they will brand me as a traitor!” Again he fell into thought. The result was that he abandoned the home consecrated by Washington, and turned upon the flag that great man had planted. On the 1st of June, a company of cavalry set out on a scouting expedition to Fairfax Court House, about twenty miles beyond the outposts. Some hundreds of Virginia troops were stationed here, and a sharp skirmish ensued. Several of the Virginians were reported to have been killed; one of the United States troops was killed, and four or five wounded, among whom was the commander, Lieutenant Tompkins. The cavalry withdrew, having made five prisoners, and leaving two of their own number as captives. On the following day the same cavalry company made another dash to Fairfax, and rescued their comrades who had been left behind. BATTLE OF GREAT BETHEL. JUNE 10, 1861.