General McClellan's headquarters, Antietam, Maryland, American Civil War Size:L: 70 x 70cm 6 May 1859 (1901)

6 May 1859 (1901)

20 April 1917

View of the old lime works

'Sir Owen Greets the Lady of the Fountain'

General McClellan's headquarters, Antietam, Maryland, American Civil War Size:L: 70 x 70cm 6 May 1859 (1901)General McClellan's headquarters, Antietam, Maryland, American Civil War, 1861 1862 (1955). Only a few federal officers knew that the man seated with a cigar in his hand was Allan Pinkerton, founder of the famous detective agency. Pinkerton, who organized the Union intelligence service, was known only as 'Major Allen'. Directly behind him is John C Babcock, who worked under Pinkerton. Next to him is George H Bangs, later a famous Pinkerton