[3] The unit disembarked at Fortress Monroe, remained in the vicinity for six weeks, then resumed their voyage which was further delayed by calms.

On June 5, 1863 the unit turned their horses over to the 12th Massachusetts Battery and departed New Orleans to take part in the Siege of Port Hudson.

Due to losses from disease and desertions, the battery numbered just 50 men fit for active duty after the Siege of Port Hudson—about one-third of its original strength.

With the 2nd Massachusetts Battery, they participated in the Second Bayou Teche Campaign intended to clear western Louisiana of Confederate forces and gain a foothold in Texas in the fall of 1863.

The members of the battery were involved in several engagements during this campaign and suffered casualties during the Battle of Pleasant Hill.