Statistics for occurrence #1 of “Headquarters” in chapter 26, page 501 of Alfred Roman, The military operations of General Beauregard in the war between the states, 1861 to 1865:

... Island. The 8-inch columbiad removed from the northeast face he wishes sent to Batteries Bee or Fort Moultrie. Very respectfully, your obedient servant, Jno. F. O'Brien, Major, and A. A. G. Headquarters , Department S. C., Ga., and Fla., Charleston, S. C., August 4th, 1863. Brig.-Genl. R. S. Ripley, etc., etc.: General,—The enemy have a picket, it appears, at night in the Marsh Battery Cree...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Headquarters (New Jersey, United States) 132 124 0 0 0 user votes
Headquarters (Washington, United States) 1,024 466 0 0 0 user votes
Headquarters (Kentucky, United States) 84 0 0 0 0 user votes
Headquarters (Arizona, United States) 2 0 0 0 0 user votes
Headquarters (Idaho, United States) 0 0 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.