New York, March 25. The Times' dispatch says the refugecs Wlio arrived within our liues yesterday, coiiflrm the statement, tb at the rebel army is fallingback fïom Frcdericksburg and being massed in the defenees boforc Riehinond. They sate the entirc fürco left at Fredoncksburg on Sunday night to have been only 8,000. They also confina tho news that the gun making maehinory aud ordnanee stores are being rapidly removod from Kichmond iuto Georgia; that the withdrawal of families from the city of Charleston has fully get in, and sales of property are being forced at a ruiuous loss. They also state that tho ackuowludged loss of cavalry sohüers sustaiued iu the recent thrashiug Averill gavo theni was bütweeu 400 aud 500 killed and wounded. Among the killed was Colonel Lagrango of North Carolina. The rebel guerrillas carne again to d:iy down our lino at Chantilly, and made a feint of attack, but 700 of our cavalry dashed at them, chased them a mile or 8'1, till in passing they received a flank fire from behind picketg and a barricade. Our eavalry wheeled and fled, pursued by the euemy, but rallied and again charged the rebels, driving them a distance of three milos. Rapid Iscrease of the Navy. - Sixteen more iron clads are to be furuished by New YearV Thirty more vossels havo beeu added to the navy since tho last Navy Register was made out, nsaking nearïv five hundred in all. Proiiibitio.n. - General Wright bas prohibited tho sale of arms, powdor, lead, aud pereussioa faps st Cincinnai. CoXFEDIilíATE ItAMS AT MüBILK Til Boston Journal states that prívate lotters from New Otleans represent that t!i Confederates of Mobile bave severa! raros in readinoss to make a demonstrtion upon tbe blockuding fleet off that port. Otf Dít. - It is said that gossip ia Ricbraoud intímate that the wilei of a charraing rebel widow hid somethiiig lo do with the losa of the Queen of thft West.