In reading milfic set in low-tech settings - usually pre-industrial -
it's not unusual to have at least a passing description of a siege
against a castle or walled town/city. However, once we start seeing
industrial settings, the siege seems to disappear.

Is it because a siege is impossible? What would make it so?

Does the impossibility continue into the Far Future? If so, why? If
not, at what level can a siege be implemented? City only? Small
island? Large island? Continental? Planetary? How?

(If someone wants to take the idea and turn it into a Freelance
Traveller article, I'm interested...)

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