NEW YORK, June 16. — A Harrisburg dispatch to the World says Hooker is threatened at Warrenton by the main rebel army, supposed to be 60,000 strong, under Lee in person.
The force in Maryland and Pennsylvania is estimated by Gen. Schenck at 40,000.
At a meeting held yesterday Gen. Cameron pledged his whole fortune to the defense of Pennsylvania, and called upon the Governor to appoint Gen. McClellan or Gen. Franklin, Commander-in-Chief of the Pennsylvania forces. At Pittsburg the factories have stopped work and all hands are throwing up entrenchments. All the archives of State and the specie of the Harrisburg banks have been removed for safety. The inhabitants were preparing to leave in great numbers.
PHILADELPHIA, June 16. — A letter from Harrisburg, dated 1 P. M., says a train of 100 wagons, which left Martinsburg on Sunday, arrived safely.
The rebel advance this morning was 5 miles east of Chambersburg.
Col. Smith, commanding at Hagerstown, had a fight of an hour and a half yesterday, when he was surrounded and forced to surrender.
The banks were removed to Philadelphia.
The Democratic Convention will not assemble here to-morrow. A number of the Western delegates refused to come further than Altona, and returned home. Hundreds of persons arrived from the south side of the river, bringing in all their horses, cattle, and other valuables. Working parties were engaged in preparing the works of defense on the opposite side of the river. Good resistance could be made if troops were here to man the guns.
Government officials expect the arrival of the rebels to-night or to-morrow. If they reach here soon there will be little prospect of a successful defense, but if detained, thousands will reach here within 24 hours, as the country is thoroughly aroused.
At a meeting last evening, Gen. Cameron blamed the Government for not sending men to aid in the defense of the Capital when Pennsylvania had so liberally contributed men and money for carrying on the war. He said while he had every confidence in the President and commander of the Department, such men as McClellan and Franklin, in whose leadership the people had every confidence, would rally to their standard. Every loyal man called upon the Governor to send for Gen. McClellan to take command of the militia of the State.
Every train east is stocked with refugees and goods belonging to merchants.
ALBANY, June 16. — Gen. McClellan is in Albany for the purpose of aiding Gov. Seymour in organizing and sending forward troops for the defense of Pennsylvania. About 14,000 are already received, and they are beginning to go forward.
The following additional militia regiments are under orders to move: 5th, 8th and 22d, and 24 volunteer regiments are here waiting to be mustered into service.
WASHINGTON, June 16. — It is officially known here, that up to this hour, the rebels have made no attack upon Harper's Ferry. The enemy is in considerable force at Charlestown, 8 miles from Harper's Ferry.