Fortresa Manroe, June 19. Tho transport Emelia aVrived to day f rom Newbern Vritb idvieed to the 17th. She reporta a's followa : The rebel coimnittee on River Fortificaticms report the Union forces in possession of country 300 rnües long and 150 railes wide, with inlaad seas and rivers filled with Union gunboats, reaching through North Carolina and Virginia, which prevenís fortifications being constructed - that while this continúes tho permanent possossion of North Carolina and Virginia caiinot be expectec!. The Unionista in East Tennossee and Western North Carolina havo organized powerful forces and are joined by thousanda of deserters and conscripts irom tho rebel army, to whom protection iá guaranteod, for the purpoee of holding the mouutain regious against the robel government. Rebel citizens have petitioned Gov. Vaneo for proteotion agninst this organization. Vanee replied that bo had o troops to send ; they must protect themselves. Tvventy thonsand insurgente have cffered to join the Union army as soon ns a military post is established at Kaleigh.