<prompt> Bhala okuqhubekayo kwalesi sigaba - Ngo-January 27, 1863, ibhethri ladluliselwa eGrand Gulf, eMississippi, lajoyina izivikelo eMfuleni Omkhulu Omnyama. Ngenkathi ibekwe eGrand Gulf, ibhethri labamba iqhaza ezimpini eziningana ezincane nama-gunboats ase-Union, yize abanye abacibishelayo babika isithukuthezi. Maphakathi no-March, ibhethri lalinakekela indawo eyaziwa ngokuthi iWinklers Bluff eMfuleni Omkhulu Omnyama, nemiyalo yokungavumeli noma yiziphi izikebhe ukuthi zidlule endaweni. Ngo-Ephreli 29, imikhumbi ye-Union Navy eyayiholwa ngu-Admiral David Dixon Porter yashaya isikhundla se-Confederate eGrand Gulf, okwaholela eMpini yaseGrand Gulf  <response>: , yize ibhethri likaLandis lalingeyona ingxenye yomugqa wangaphambili we-Confederate. Enye inqaba yakwazi ukumelana naso, ngakho uGrant wathumela amadoda angu - 24 000 emfuleni eBruinsburg. La madoda asheshe athuthela empumalanga emfuleni, ehola uBrigadier General John S. Bowen, umlawuli we-Confederate eGrand Gulf, ukuthi athumele ibutho elivimbela iPort Gibson ngomzamo wokumisa ukuhlasela kukaGrant. Ekuseni ngoMeyi 1, ama-howitzers amabili kaLandis Battery kanye nabasebenzi bawo bathunyelwa ukujoyina amandla okuvimba. Ngesikhathi seMpi yasePort Gibson, ibhethri ladubula amadoda kaMajor General uJohn McClernands Union corps futhi lahlanganyela empini ye-artillery ne-8th Michigan Light Artillery; iyunithi yalahlekelwa abantu abathathu ngesikhathi sokulwa futhi ayizange ihlukane kuze kube sekupheleni ntambama. Ngesinye isikhathi empini, ibhethri laphinde labhekana nomlilo we-Union sharpshooter, ngaphambi kokuhlakaza abahlaseli babo nge-canister. Naphezu kokubambelela ekuqaleni, ingcindezi ye-Union yagcina iqhubekela kwesokudla sikaBowen, yabangela ukuthi ama-Confederates ahoxe ngaphambi kokuba uGrant abedlule. Ngemuva kwePort Gibson, ama-Confederates aphoqeleka ukuthi ashiye isikhundla sawo eGrand Gulf ngoMeyi 3; I-Landiss Battery yaphinde yasebenza njengengxenye yomqaphi wangemuva. 