How does the hero defense bonus apply? If its on 20%, then all the defender troops got 20% defense bonus? (sound broken) Or just the troops I sent there? Or the troops of my tribe?
The def bonus will apply to all of your own troops as long as your hero is defending with your troops.
"Def bonus: Points put into this ability increase the defence value of your whole army (means all own troops defending - the village where they come from is unimportant) by 0.2% per point (maximum of 20%) This bonus only applies if the hero is defending with the army. Other defending troops which are not under your control, will remain unaffected by this bonus."
You can read more about the different hero bonuses here.
You didn't ask this, but it is also important. For defense, the weapon bonus only applies to troops from the the village the hero is currently based out of.
"Please note that all items only work for either the hero alone or for troops attacking/deffending together with the hero. They do not give an effect to troops which do not have the hero with them (means the troops have to be from the same village the hero is from)."
You can read more about hero weapons here.
The post was edited 2 times, last by kit: Edited to add links to be more like Lemon's answer. ().
To confirm, the hero defense bonus applies to ALL your own troops regardless of village, but the item applies only to troops from the same village as the hero?
Yep, that's it in a nutshell