Now York, May 4. Newbern advices to April 30t!i conBrm the evacuntion of Washington, N. 0., by order of Gen. Butler. Afier spiking the guns and destruction of much property that could not bo carried away, ït was diseovored fluit tho enemy liud left for Virginia, leaving but sevcn oompanies in front of the place. The rebels have already comnienced ninssacreing all vvho have aceepted President Lincoln's amnesty proclamatiou, and pressing intf their service all cspable of benring arms. Gen. Peck ia ordered to report to Ger.cral Hutlor's hcdquirters for sueh ligbt dut-ies as his hcalth will enable liim to perfunn. 1 1 was roported the rebel ram Reanoke, now at Plyuiouth, ia now d Inving tor the purpose of disinounting the '200pounder PaiTOtt gun whioh feil ín to rebel hands. lt was generally belicved in tho interior that the fall of Plymouth and the evacuation of Washington will enable Gov. Vanee, the secession candidate, to secure his election.