MWIN Wrote:Is this legal?
Since there is no indication that he will 'sneak' the workers at the end of turn, and they also will spend a whole turn roading so they will be 'visible' for Byzence. (but I trust them to pretend they are encouraging religion spreading

Of course that is as long as the chariots DON'T double move, but there is no need for it imo.
But hiding them 1t inside the border and using roads to allow them to move 3t in total and attack all the SAME turn is perfectly fine.