I agree with these guys, this is definitly a confusing thread ")
So if Austria trains up an army and declares war on Germany or the 'allies'?
Why would Austria want to decllare war on anyone because as Hawk said there us no where they can invade from within there country and it would be stuip of them to attack Germany, they coyuld just get themselves annexed which is what happened anyway. Now how could the 'austrian army' divert the 'allies' attention are they gonna use a big banner that says 'look at me' 'look at me' or something like that (just kidding)
The only thing I can think of is maybe invading the Italians and attacking france through marseilles in the south of france but that would just be like shooting yourself in the foot, why attack an ally with just 150,000 then invade another country with the same force, it isn't enough men to occupy italy as well as attack france, although it would divert the french attention south, but if that is the case then the germans would smash through the ardennes (which is what happened) attack around the flank of the maginot line, take france and end the war with the month, nothing had changed, except that austria has an army which has taken losses from the fighting and instead of the italians in north africa it'll be austrians and I don't think the french would worry to much about an austrian army lol.
Now if the austrians did attack switzerland and somehow managed to win and take of the country, it would open another door into france but I think the results would be the same in the end.