Does the damage resistance from different artefacts accumulates?

[Handel]

And is there a way to see he overall bonuses the hero gives to the troops (besides attack/defence)?

[Keneth]

I don't think there's a way to see the bonuses but yes, they stack.

[Calinda]

Put mouse pointer over defense in a troop stat screen and you can see the resistances, and yes, they stack.

[Keneth]

Huh, I've never noticed that. Probably because I never paid any attention to the stats.