Spain doesn't intervene in the 1529 Ottoman siege of Vienna

It wasn't the Spanish intervention that halted the Ottomans but the time it took. By Winter they had to retreat.

This. If only it haden't been such a wet summer...

The only thing I can see being different in the Spainards would have had a field force to deploy elsewhere in the Empire: they're currently at war with France over Italy, so its possible we see a stronger push there.
 
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