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[–] Niggardly_Jew 0 points 2 points (+2|-0) ago  (edited ago)

“The attacker can exploit just one vulnerability to get in, while the defender needs to protect all ways in.”

The attacker can select the weakest point of defense and exploit that vulnerability. If there are two ways to make an attack, the defender must split his resources to defend both while the attack consolidates his resources to attack one. In reality, there are infinite ways to attack. Which means the defender must divide his resources among an infinte number of possibilities to ensure successful defense.

"Defender's advantage" refers to the defender's ability to select the terrain. If the terrain is bad, they can retreat to better terrain to provide them more of an advantage. This is a useless "advantage" in guerilla style warfare because selecting a battlefield is not applicable (excepting ambushes, which are an attack).

More simply put, being sniped by someone a mile a way, or hit by a mortar from 10 miles out, is almost impossible to defend against. As long as your position is known, you're vulnerable to enemies who you do not know the position of. The attacker must necessarily know the defender's position to attack, while the defender cannot predict the attacker's position, so the attacker always has advantage.