three looked at each other, then rose and said, "As you wish, esteemed elder."......At the same time, at Duke Wen's heir's residence, the heir wrote a letter and handed it to someone beside him, sayi...ent warfare was like this, because communication was inconvenient, and messages often took days to deliver.If it's a round trip, it could take as long as half a month, even if the journey is a little...