Cavemen

[Forrest]

Strength 17 and cost of 40gp. But useless in battle. However I seem to remember the siege formula being a bonus for strength over 10. So would cavemen a good siege army to follow your main army around or to reinforce key castles?

[Sombre]

If you like paying way over the odds for okish siegers, sure.

[Aezeal]

but wasn't there something with strengthx strength for siege what would that make them compared to 10 gold strength 10 troops?

[Tuidjy]

Yes, they are better than one 10 gold, 10 strength trooper. No, they are not
better than four of them. They eat less, though. I like using the commanders
as early thugs. Otherwise, I do not recruit them.

[Saulot]

Cavemen - 17 str = 2.9 siege strength or 13.8 gold per siegepoint.

Basic human infantry - 10 str = 1 siege strength or 10 gold per siegepoint.

Like Tuidjy says, unless you have supply problems, never worth it, and even then, not really.

[K]

They have partial cold and fire immunity. Combine them in the late game with the spells that grant your troops partial immunity and armoring spells, and you've got a crack squad of late-game troopers that can survive massive Evoking.