Zhè wèi jiāngjūn suīrán shì wǔfū chūshēn, què xiě de yìshǒu hǎo zì.
Though the general started out as a soldier, he writes beautiful calligraphy.
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武夫 usually sounds a little dismissive: a man of force rather than learning. 一介武夫 'a mere soldier' is often said modestly of oneself. In the Book of Songs phrase 赳赳武夫 'valiant warriors' it is admiring.