Rubuta ci gaba ga wannan sakin layi - A watan Maris na shekara ta 1861, an ba Ferguson kwamishinan kyaftin din a cikin 'yan bindigar South Carolina, bayan haka aka nada shi Laftanan kuma mataimakin-de-camp ga C.S. Army Brigadier-General P. G. T. Beauregard. Ya kasance ɗaya daga cikin jami'an da suka karɓi ƙaddamar da Major Major Robert Anderson a Fort Sumter, ya ɗaga tutar Amurka ta farko, kuma ya sanya masu gadi na farko a Fort Sumter. Bayan kewaye, an aiko shi don gabatar da tutar Confederate ta farko da abokan gaba suka harbe shi zuwa Majalisar Wakilai ta Tarayyar. Ya kasance Laftanar-Colonel kuma mai taimakawa ga Janar Beauregard a lokacin yakin Shiloh
Ka yi haƙuri. A lokacin yakin Farmington, yana cikin Rundunar Sojojin Mississippi ta 28. Ya umurci ƙungiyar yayin kare Vicksburg, kuma ya taimaka wajen dakatar da hare-haren da Major-General William T. Sherman da US Commodore David Porter suka yi.