In this fourth installment of The Low-Cost Destruction Threshold Doctrine, Nicolin Decker examines infrastructure warfare and the legal boundary between strategic importance and lawful targetability.

Modern infrastructure often serves civilian and military functions at the same time. The episode therefore asks: When may civilian infrastructure lawfully be attacked?

Drawing on Article 52 of Additional Protocol I and customary international humanitarian law, Day 4 explains that economic value, strategic importance, or contribution to national endurance does not automatically make infrastructure a lawful target. The inquiry must remain attached to the particular object, its current military function, the definite military advantage anticipated, and the civilian consequences that may follow.

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