Both regiments were brigaded under the command of Colonel James C. Veatch, and ordered to decamp and move out to support the heavily pressed General Sherman on the right wing.

Moses Gleason Montgomery describe heavy fighting at the Hornet's Nest before proceeding on to their defensive position supporting the retreat of the right wing.

Sgt Montgomery was shot in the chest during this engagement, and describes his survival that night by a 'Blessed rain'.

On the second Day of battle at Shiloh, General Grant took direct command of the 14th and 15th Illinois in the counter attack against P.G.T.

After the engagement, General Grant directed that the 14th and 15th Illinois volunteer regiments would remain together for the duration of the Civil War.