Washington, Jan. 25. - The battleship Hajne is in Havana harbor. The torpedo boat Dupont, which left Key West at 6 o'clock in the evening with the Maine and mailing orders, hailed the. Maine .t Dry Tortugas and delivered the orders for the battleship to proceed to Havana at once. The Dupont then retnrned to Key West. She reports that the Maine was about to sail when she left. It is believed at the state departinent that the Maine entered the hartor of Havana at the earliest hour in -the morning that the Spanish fort regulations permit. No direct report, hovrever, lias yet been received from Havana.