Either as "Major" or "Sir".
The web address of the Tramp Brigade - Organization Of Historical Interpreters is: www.trampbrigade.com
There is no such rank as Brigade General. You're probably thinking of Brigadier General. Brigadier General is a one star rank, whereas Major General is a two star rank. Usually, a Brigade will be commanded by a Colonel, although it's not unheard of for a Brigadier General to be in command of a brigade. However, more often than not, they'll serve as a deputy to the Division Commander (who would usually be a Major General).
The address of the Division Cavalry Brigade is: 10159 Bellefontaine Rd, Saint Louis, MO 63137-2001
The address of the Faulkners Light Brigade Inc is: Po Box 444, Guilford, CT 06437-0444
The address of the Florida Antique Bucket Brigade is: 6855 Green Swamp Rd, Clermont, FL 34714-8357
The address of the Brigade Of The American Revolution is: 9 Hidden Meadow Ln, New Canaan, CT 06840-2703
The address of the New Jersey Militia Heards Brigade is: 14 Wood Duck Cove, Oakridge, NJ 07438-8882
The address of the Abraham Lincoln Brigade Archvs is: 799 Broadway Ste 341, New York, NY 10003-6827
The address of the Tramp Brigade - Organization Of Historical Interpreters is: 347 Stanley Dr, Murrells Inlet, SC 29576
The address of the Hoods Texas Brigade Association Re-Activated is: 605 Pecan Grove Road, Austin, TX 78704-2507
The address of the First Battalion Brigadier-General Delanceys Brigade Inc is: 57 Teeter Rock Rd, Trumbull, CT 06611-5023
The address of the Missouri Irish Brigade Of Civil War Re-Enactors is: 4118 Harrison Street, Kansas City, MO 64110-1210