<prompt> Pedzisa mutsara unotevera: Wissahickon yakavakwa muPhiladelphia, Pennsylvania. Yakatumirwa munaNovember 1861, yakatanga kushanda muGulf of Mexico uye paRwizi rweMississippi, uko muna Kubvumbi-Chikunguru 1862 yakabatanidzwa mukubatwa kweNew Orleans, kubhomba kwe  <response>: Grand Gulf, makomba maviri akapfuura masvingo eConfederate achiraira rwizi paVicksburg uye hondo ne ironclad. 