THE BRETHREN : A Romance of the Crusades
The first appearance was as a serialized novel, published in Cassell's Magazine December 1903 through November 1904 . H.R Millar created 66 illustrations for this publication.
McKay, Scott, and Whatmore claim that Longmans, Green, and Company published the first edition in book-form in London on September 30, 1904. Ads at the end of the book are date-coded 9.04. Apparently 15,000 copies were printed, without any illustrations.
McClure, Phillips and Company published the first American edition October 2, 1904. There are no ads at the end of the book, but 16 of Millar's original 66 illustrations are included on plates. McKay and Scott both agree on the publication date in New York.
The Copp, Clark Company published the first Canadian edition (by arrangement with Cassell) in 1904. There are no dated ads at the end of the book, but 4 of Millar's original 66 illustrations are included on plates. It is curious that this edition has 4 illustrations while the Cassell has none. This edition is similar to the Cassell first edition, if not from the same printing plates.
See the VisualHaggard.org page dedicated to the illustrations found in various editions.
Cassell's Magazine ran an article in its November 1903 issue concerning "Haggard's new story"
I own the complete serialization of this novel in CASSELL'S MAGAZINE, but the copies shown below are not mine.
The only full-page illustration, of the 66 illustrations included in the serialization.
An excellent copy of the British first edition, pictured below.
Sadly, my copies are not as nice.