Day of Truce

Story, first published: Galaxy Science Fiction, Feb. 1963

The local "Punks" take advantage of the once-a-year truce to ransack the last fortified house in the suburbs.

Wikipedia: Clifford D. Simak

Gangs of mischievous suburban children have become such a nuisance to property owners who want the damn kids off their lawn that there's been an arms race between the two sides that has led to self-respecting suburban homes becoming fortresses protected by electrified fences, moats, and lethal booby traps. The kids, for their part, employ catapults and bombs to break down the defenses. Deaths are common.

Brendan: Balancing Frogs