Kammala jumla mai zuwa: Saboda kotun sojan sa, Riker bai iya jagorantar rundunarsa ba yayin ci gaban Manassas a farkon Maris 1862, amma ya sami damar jagorantar mutanensa daga baya a wannan watan zuwa Fortress Monroe, tare da sauran Sojojin Potomac, a matsayin wani ɓangare na McClellan's Peninsula Campaign. Riker ya jagoranci rundunarsa a yakin Williamsburg da kuma
Yaƙin Fair Oaks a watan Mayu 1862.