As far as what I'm saying, I'm just stating based off of histroy. Look up the 6 day war. That's probably the best example I can give.
Divine intervention? I don't see it any more than divine intervention when Washington crossed the Delaware and took the Hessians by surprise. It's a common military tactic.
There are Scriptures in the OT indicating two regatherings. First one in unbelief..they will be building the Temple and making a compact with death (antichrist) all in unbelief. Then there are passages speaking of a 2nd regathering in belief. At least this may help explain your quandry even though you'll probably still have your doubts.