This letter is of a particular interest, partly because it's in code, a not very complex number for letter substitution, but also because it was written at the turning point of Napoleon's career.
这份书信是用密码写的,用的字母替换法也不难理解,而且书写这封信时,拿破仑正处在事业的转折点,因此这封信很有趣。