What have been decisive weapons?

[Pannonian]

Oh, I forgot one more crucial innovation in warfare that decisively changed things worldwide: the bright European idea of putting guns on (big) ships. While it took them until the 19th century to achieve a decisive technological advantage on land, at sea Europe had been far ahead militarily since the 15th.

There had been projectile weapons on ships before that, and people had been experimenting in trying to fit as many and as big guns as they could on deck. However, naval-wise, I'd nominate the Brit who had the bright idea of putting a plane on a ship. By putting those two arms together, the idea of the fighting ship became obsolete.

Other landmarks:
Developing the cavalry mount - armies became that much more mobile and long-range, especially those who relied most heavily on horse.
Tinned food - states could now prepare long, long in advance for long, long campaigns.
Internal combustion engine - armies and navies were no longer dependent on organic transport or windpower, but on fuel that was easily stockpiled.

Army A has modern personal weapons, but is limited to horse transport, and specifically pre-cavalry horse, and traditional methods of feeding the army. Army B is armed with pre-gunpowder weapons, but has access to stockpiled supplies and modern transport, assumed to be lavishly supplied with fuel. Neither army can use the other's resources. Who would win?

[Rhyfelwyr]

There had been projectile weapons on ships before that, and people had been experimenting in trying to fit as many and as big guns as they could on deck. However, naval-wise, I'd nominate the Brit who had the bright idea of putting a plane on a ship. By putting those two arms together, the idea of the fighting ship became obsolete.

Other landmarks:
Developing the cavalry mount - armies became that much more mobile and long-range, especially those who relied most heavily on horse.
Tinned food - states could now prepare long, long in advance for long, long campaigns.
Internal combustion engine - armies and navies were no longer dependent on organic transport or windpower, but on fuel that was easily stockpiled.

Army A has modern personal weapons, but is limited to horse transport, and specifically pre-cavalry horse, and traditional methods of feeding the army. Army B is armed with pre-gunpowder weapons, but has access to stockpiled supplies and modern transport, assumed to be lavishly supplied with fuel. Neither army can use the other's resources. Who would win?

If it was on the defensive, Army A would win. Of course a large-scale offensive for army A would be almost impossible.

[KrooK]

Weapons that allows victories even when army which used them commited so many mistakes that normal it would loose in any conditions.

1. Charrior
2. Greek phalanx
3. Roman pilum
4. Crossbow
5. Gunpowder
6. Hussaria lance
7. Bayonett
8. Improved missile weapon
9. Plane
10. Tank
11. Nukes