CDV featuring a group of Union officers and enlisted men seated and standing in front of buildings and tents, identified and described by pencil inscription on verso as, "49th Mass at / Port Hudson, La / 1863," with no studio imprint.

The 49th Regiment, Massachusetts Infantry travelled toward Port Hudson in May of 1863, and saw two major assaults, the first on May 27th, in which the regiment suffered 16 officers and men killed and 64 wounded (including Colonel Bartlett and Lieutenant Colonel Sumner), and the second on June 14th, in which the regiment came under fire, suffering one man killed and 17 wounded, though they played no active role in the assault. The regiment remained in place, performing trench duty until the Port was surrendered on July 9th.