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British sympathies for the Confederate cause waned in 1863, after Southern losses at Second Manassas and Gettysburg. Confederate attempts to use Canada as a base for operations stirred fears that Britain could lose its sole remaining North American colony. Also, Confederate bonds marketed in London began going belly-up as the tide of battle turned against the South. And Lincoln’s Emancipation Proclamation, late though it came, lessened support for the South.

One further word of praise for Ms. Foreman. In explaining why her book required a decade of work, she notes that during the 10 years she bore five children (including twins) and cared for her husband, who had a bout of cancer. Nonetheless, she scoured sources across two continents, and her chapter notes span an astounding 116 pages.

Throughout, she is a historian who views the tragedy of the war with objectivity, and whose narrative contains a valuable commentary on the Civil War as seen through non-American eyes. Five stars, at least.

Joseph C. Goulden’s revised edition of “SpySpeak: The Dictionary of Intelligence” will be published by Dover Books in the fall.