Big weapons only pay off when fights are one-on-one duels

Evidence

But it’s his linear law that is most relevant to the evolution of extreme weapons. By contrasting ancient and modern warfare, Lanchester helped define the circumstances in which large weapons will, and will not, be cost-effective. When opponents can concentrate their fire—gang up on an opponent simultaneously—investing in large weapons is probably a mistake. On the other hand, when soldiers duel each other at close range, face-to-face and one-on-one, then the better fighter is likely to win. Because fighting ability often depends on the size of a weapon, duels can lead to situations where bigger and bigger weapons prevail. — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 238

Categorization

• XREF: This is the direct bridge to animal fighting: one-on-one territory duels select for extreme weapons exactly as Lanchester’s linear law predicts. Also connects back to earlier chapters on animal contest evolution. — connects to: Concentrating simultaneous fire disfavors large weapons while duels favor them; Weapons disappear when fights stop being duels over defensible resources; When balancing selection fails, bigger weapons win every round and escalate the race. (+7 more)

Related

• Concentrating simultaneous fire disfavors large weapons while duels favor them (similarity 0.94)
• Animal and human fights both hinge on whether duels or gang-ups occur (similarity 0.90)
• Dueling plus competition and defensibility is the general rule for extreme weapons (similarity 0.90)
• One-on-one duels favor weapon evolution while chaotic scrambles do not. (similarity 0.89)
• When balancing selection fails, bigger weapons win every round and escalate the race. (similarity 0.87)
• Intense competition without duel structure does not drive weapon evolution. (similarity 0.86)
• Deterrence amplifies the evolutionary payoff of extreme weapon size. (similarity 0.84)
• Specific conditions are required before weapons escalate into an arms race (similarity 0.83)
• Three conditions must align to trigger an animal weapons arms race. (similarity 0.83)
• Weapon size in animal species is under stabilizing selection, not open-ended directional selection (similarity 0.83)
• Reproductive success, not survival, drives the largest animal weapons (similarity 0.83)
• Bigger weapons usually fail because their costs outweigh their benefits (similarity 0.83)
• Weapon evolution and deterrence form a self-accelerating spiral. (similarity 0.82)
• Medieval combat structured even battlefield clashes as ritualized one-on-one duels (similarity 0.82)
• Weapons primarily deter rivals rather than inflict harm in actual fights (similarity 0.82)

Broader Connections

• One-on-one duels favor weapon evolution while chaotic scrambles do not. #corroborates (0.90) — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 245
• Intense competition without duel structure does not drive weapon evolution. #corroborates (0.85) — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 242
• Dueling plus competition and defensibility is the general rule for extreme weapons #expands (0.80) — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 266
• Burrow-guarding constrains fights to duels and drives weapon evolution #exemplifies (0.75)
• Animal and human fights both hinge on whether duels or gang-ups occur #expands (0.70) — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 239