I'm sure a deadline was set and that prepes were made incase war happened. If Moo really pinged out then that is the most horrible luck ever, for all sides concerned. What I think happened was that Pacifican forces knew the time to go unless they heard otherwise. Of course if Moo pinged they didn't hear otherwise. (If that's the case then it was bad planning as they should have been waiting to be told to go instead of being told not to go) NPO got in quite a few declarations before TORN got one. Bigwoody seeing that Pacifica had attacked not knowing that Moo couldn't confirm or deny an attack released his hounds as soon as it became apparent that there was no going back. Bigwoody probably delayed in his posted DoW so he could see wtf happened to Moo at the end there.
At least that's how I imagine it went down. I could be really wrong.