I first discovered the Napoleonic cryptographic battle a few years ago when I was reading Sir Charles Oman's epic History of the PeninsularWar.
几年前,我在阅读查尔斯·奥曼爵士的恢弘巨著《半岛战争史》时,第一次发现了拿破仑时期的密码战。
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Photograph from the main eastern theater of war, the Peninsular Campaign, May-August 1862. Selected Civil War photographs, 1861-1865 (Library of Congress)