New York, June 9. A Washington dispatoh snys it is rumored that Gen Stonenian has resigned Lis commaud of the cavalry of tho Potomac, and that Gen. Plcasauton will succoed hira. Acother dispatch says that an officer just returued frora llichmond, says he saw twenty-oue rcgiuicnts pass through there on tbcii way to Lee's army. Several regiments of cavalry froin Nortb Carolina followcd them. Washington, June 8. from what can bo ascertaiued frora persons arriviug,from tho llippahannoek, a división went over the river at Franklin's Landing, last night, and the rebel í'ifle-pits, foliage, &c, along the bank3 have been destroyed, so that thc enemy will not find cover from wliich to aDnoy us. Earthworks have been thrown up in the front with a view of preventing a night attaek, and shield our men if tho moa should opeu a oauuonade. The troops we have thrown over are not far from thc town. Tho movemont of both arnaies are involved in mystery. Au evening paper says the agent from the Army of the Potomac states that on Wednesday night last a portion of the rebel army crossod tho Rappahannook not far from Falmouth, but soon after returned.