Hi,
If my opponent use Kingswood Trail on my Bringers of Law, can I untap my character or not?
In my opinion it's no because Bringers of Law untap when an opponent declares a challenge against you and Kingswood Trail kneels when he declares attackers.
And I think you declare a challenge then you declare attackers. I may be wrong, if it happens at the same time I guess the active player (so the attacker) choose the order of resolution (that won't change a lot of things I guess).