Rubuta ci gaba ga wannan sakin layi - A watan Mayu 1864 an canza shi zuwa umurnin Artillery a lokacin kewaye Petersburg. A ranar 12 ga watan Disamba, 1864, Shugaba Abraham Lincoln ya zabi Abbot don nada shi a matsayin babban brigadier janar na masu sa kai don zama daga ranar 1 ga watan Agusta, 1864 kuma Majalisar Dattijan Amurka ta tabbatar da nadin a ranar 20 ga Fabrairu, 1865. A watan Disamba na 1864 an sanya shi a matsayin kwamandan dukkan bindigogi na kewaye a cikin Sojojin Potomac da Sojojin James waɗanda ke kewaye da Petersburg. A cikin Janairu 1865 Janar Alfred H. Terry ya nemi Janar Abbot ya bi sojojinsa zuwa Fort Fisher. Abbot ya umurci brigade na wucin gadi na makamai masu linzami a lokacin nasarar yakin na biyu na Fort Fisher
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