Very short question on assassination and spying

[onomastikon]

1. If my assassin has "leadership" (can have troops) and leads some assassin-type troops (e.g. spider bane), does the whole troop get to go gang up on the target during assasination or only the commander?

2. I set the battle order of my spies on "retreat" so they dont charge the patrols that find them, but they still die when they are discovered -- why? Can I help this?

3. Is there a way to search for magic sites (if I have a stealthy mage) without having to attack the province (as it seems happens now)?

thank you