In the Scroll of Ester you can see the decree of the king could not be changed. He told Ester that she could send another letter, but not change the original decree. So she wrote that  Israel could defend themselves. But the enemies still had the original decree, plus almost a full year of warning. So did they defend themselves? From the Scroll itself all you see is that the enemies of Israel were wiped out. Did no one defend themselves? Apparently the ones that were the most afraid decided to convert. But that is about it.

I wanted to mention that this אחשוורוש is Xerxes [that is how Xerxes is said in Persian] of the 300 Spartans. So if you look in Herodotus you will see an event with an advisor of Xerxes.  The name looks suspiciously like Mordechai. [ The king was having second thoughts about invading Greece. He was warned from heaven that he must go ahead. Then he put Mordechai on his throne at night to see if he would have the same dream. He did.]