The second assault on the Confederate works at Port Hudson occurred during the prolonged siege where Union forces aimed to capture this crucial stronghold. Major General Nathaniel P. Banks led the Union troops against the entrenched Confederates, who were under the command of Major General Franklin Gardner. The Union assault was initiated on June 14, 1863, directly after the failure of a previous offensive in May. Despite a fierce and determined effort by the Union soldiers, they faced significant challenges posed by the fortified Confederate defenses and the natural terrain around Port Hudson.

The Union troops advanced under difficult conditions, with many units bombarding the Confederate positions, but the resilience of the defenders proved formidable. The fighting was intense, often characterized by close-quarter engagements and heavy artillery exchanges. Reports indicated that the Union suffered substantial losses, with many soldiers falling to enemy fire or succumbing to the harsh environmental conditions, including the heat and humidity of the Louisiana summer.

Despite the setback on June 14, the subsequent tactical overview of the siege highlighted the importance of combined arms operations, as artillery, infantry, and cavalry units engaged in coordinated efforts to breach the Confederate lines. Although the assault was ultimately unsuccessful, the campaign would continue, culminating in the eventual surrender of Port Hudson on July 9, which significantly bolstered Union control over the Mississippi River and contributed to the broader strategy of Anaconda Plan employed by Union General Winfield Scott.