If it was on defence then I wouldn't let an allymate die for it, but on an attack I'd just recall. And I'd ask how we know where they are real, and if told it was a spy I'd probably go apeshit and leave the alliance, regardless of whether it was defence/attack. I don't want to be associated with that sort of asshattery.
I can vouch for this, toby doesn't put up with anything dishonorable.