My understanding is the entire garrison of Fort Blakely was captured, which was approx 3400. It was the garrison of Mobile, approx 4500, that headed north toward Meridian, 12th, , led by Gen. Maury. They reached near Meridian and on the 21st moved to Cubs Station,on the Miss-Alabama line in preparation for a possible movemet by rail to NC to join Gen. Johnstons army. Here. on April 24th that Maury's army received official confirmation on the surrender of Lee's Army and the capture of Jefferson Davis.. notes from 2 sources-"Mobile, 1865-Last Stand of the Confederacy: by Sean O'Brian and "History of the Campaign of Mobile" by C.C.Anderson.
In my youth, I lived in Whistler, Ala, where the Confederates were prevented from buring a bridge to stop Union pursuit, and is thought to be the site of the last shot of the Mobile Campaign.
Anyway, with Maury was Gibson's, Holtzclaw's, and Ector's brigades + the artillery commands from Spanish Fort and Mobile. Reminents of Sear's brigade, about a dozen officers and 55 enlisted men were attached to Ector's brigade.