baptism of fire
noun phrase
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The military sense of baptism of fire can be found in, among other texts, a 1907 history of a Massachusetts regiment in the Civil War: "That night we camped sixteen miles from Baton Rouge where we remained until the 21st, on which day we received our baptism of fire." Users of that sense, referring to a soldier's first exposure to enemy fire, as well those employing the more general sense of an especially difficult initiation, both allude (knowingly or unknowingly) to a Biblical passage: "I baptize you with water for repentance, but he who is coming after me . . . will baptize you with the Holy Spirit and with fire" (Matthew 3:11, RSV). The use of baptism of fire to refer to such a spiritual baptism dates to at least the early 1600s. Non-biblical, metaphorical use for any introductory or initial experience that is a severe ordeal arose in the mid-1850s.
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“Baptism of fire.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/baptism%20of%20fire. Accessed 18 Aug. 2026.
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