Found a 1784 reference to George Brewer. Thought it might help you.
Appreciate anything you come across on Benjamin Brewer.
Georgia Roster of the Revolution Containing a list of the States' Defenders, Officers & Men; Soldiers & Sailors, Partisans & Regulars; Whether Enlisted from GA or Settled in GA after the Close of Hostilities. Lucian Lamar Knight, 1969, Genealogical Publishing Co. Bounty Surveys (Head Rights) recorded by the Surveyor-General in the office of the Secretary of State Surveyor General's Book "K" Pg. 301 ASHWORTH, BENJAMIN. 575 acres, Franklin Co., bounded N. Washington Co. line, E. Benj. Brewer, S. Wooten & Walton, W. surveyed, survey 3. Jan. 27, 1786, p. 2. Pg. 24 BREWER, ERASMUS. Certificate of Col. E. Clark, 26th March, 1784, that he was entitled to bounty of 250 acres, and prays for same in Franklin Co. Pg. 244 BREWER, GEORGE. 287 1/2 acres, Franklin Co., bounded S. county line, other sides vacant, survey 353. June 1, 1784, p. 353. Pg. 377 APPENDIX E. GEORGIA SOLDIERS OF THE LINE--REVOLUTIONARY WAR. Copied under the direction of Mrs. William Lawson Peel, from the original papers in the office of the Secretary of State. Brewer, Erasmus. Brewer, Geo. Brewer, Moses. Brewer, Wm. Pg. 27 BREWER, MOSES. Certificate of Col. E. Clark, 17th September, 1784. Entiledto a bounty of 250 acres. Pg. 30 BREWER, WILLIAM. Certificate of Col. Wm. Candler. Entitled to a bounty of land as a refugee soldier. Prays for same in Washington Co.