When the Confederates surrendered at the end of the Siege of Vicksburg, the men of the battery became prisoners of war.

On December 28, the battery officially joined the Confederate States Army while at Springfield.

After joining the army, the battery was assigned to the First Missouri Brigade and equipped with two 6-pounder guns[1] and four 12-pounder howitzers.

In contrast, Union artillery began firing at the two Confederate batteries, inflicting casualties.

Wade's Battery retreated in what historians William Shea and Earl J. Hess described as a "wild disorder.

[1] In early 1863, the battery was transferred to the Vicksburg, Mississippi area, where it occupied a fortification known as Fort Wade.

After Grand Gulf, the battery was temporarily placed on detached service, and missed the Battle of Port Gibson on May 1.

[13] Wade's Battery was attached to Francis Cockrell's brigade in John S. Bowen's division.

[13] On May 17, Wade's Battery formed part of a Confederate line guarding the crossing of the Big Black River.

After reaching the defenses of Vicksburg, the men of the battery were assigned a new weapon–a 32-pounder rifled cannon.

Beginning in late June, they began digging a tunnel for the purpose of detonating a charge of gunpowder under the Union line, but the Confederate garrison surrendered before this could be completed.