The third light battery under the command of Captain Thomas S. Gilbert was organized at Fair Haven during the fall of 1864, some of its members enlisted for one and some for two years' service.

One section of the battery with four 4.5-inch siege guns was posted in front of General Grants headquarters, where it could cover the wharves and store houses until the gunboats were driven back when it returned to the redoubts.

With the infantry and engineers having gone forward and while the major assault was in progress they stood by their guns ready for action if the necessity presented.

[2] Following Robert E. Lee's surrender the battery was employed to dismantle the enemy's fortifications and remove the heavy ordinance near Chaffin's Bluff on the north side of the James.

On June 23, 1865, members of the battery whose terms expired prior to October 1, was mustered out of service, returning to New Haven where they were paid and finally discharged July 3.