the.com/defense

The art of making your opponent's best plan their worst mistake.

means The act or means of protecting something from attack, harm, or challenge — whether a fortress wall, a courtroom argument, or a backline holding firm.

from From Latin 'defendere,' to ward off or repel — built from 'de-' (away) plus '-fendere' (to strike or hit), a root that also surfaces in 'offend' and 'fence' itself. It traveled through Old French 'defens' before settling into English, carrying the old battlefield logic intact: to defend is literally to strike the danger away from you.

costliest peace
Global military spending tops 2 trillion dollars yearly
oldest move
Castles used moats, walls, and boiling oil as layers
immune system
Your body fights off threats every single second
game theory
Best defense often deters the attack entirely
word root
From Latin defendere, meaning to ward off
for instance

maginot line — french fortification system built 1930-1940 to defend against german invasion

great wall of china — 2,296 km defensive barrier built across northern china starting 7th century bc

siegfried line — german defensive fortification system opposite the maginot line during wwii

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