From New Orleans

Washington, April 21. The Union Assoeiation of Ne Orlean held a meeting and adopted res[ olu liona to petitition Congress to allow the people to hold a convention to lorm a State govirnn.i'tjt. The movement is supporled by some of the most thoughtliil eitizens. A regiment of blacks fur heavy artil lcry has buen recruited. Gen. BanKS has authorizod tho organization of a new white regiment and two eompanies. were already being fonned. The liealth of the ci?y was remark ubly good. It is stated by paroled seamen from the frignte Mississippi, who had reach ed New Orleans, that the rebel gunboat Webb was destroyed in the Port Hndson tight, that our Üeet did great darnage to the batteries there, and in ene battery alone twerity-five rebels were killed. The eneiny was Several times drven from their guns, and one ol their biittenes was spiked. Admira] Kárragijt's Öecretary had arrived at New Orlfans wiin dwpatch es. Farrugföt was blockading the rnouth of the Red Kiver. On the tiiji down from Vicksburg the fleet engaged ihe batteries at Grand Gulf. Tiie Swjtzerland and Hartford j were hit, hut i be ouly thing serious was the fatal wounding of olie man in tho Hartford.