If a non-unique single character is declared as an attacker and the toll gate is used to remove him from that challenge, can that player initiate another military challenge or does that count as his military challenge for the round? Could the defender wait till after defenders are declared, declare no defenders, and still use the toll gate to remove the non-unique before results are tallied?

LashtonBryth said:

Nope. You initiated it. You only get to initiate one challenge of each type, whether it resolves or not.

Anyway, if you got to "redo" the challenge, what would be the point? ~ "I declare a military challenge with this one non-unique guy." "I use Toll Gate to stand that guy and remove him from the challenge. Challenge over." "OK. Since that didn't count as my military challenge, I declare a military challenge with the same non-unique guy."

LashtonBryth said:

Yes. It doesn't matter whether you use it before or after defenders are declared, so long as the character is removed before the challenge resolves.

If you have any other plans for the challenge just keep in mind that a challenge ends immediately without resolution if there are no participating characters. So don't remove a sole attacker until after you've declared a defender or initiated whatever other effects you want to initiate.