The book of Esther took place in Babylon, well after the exile of the Jews from their homes in Israel. There are no battles against Israel that take place in its pages, much less ones in which God destroys all of Israel's enemies. I think perhaps you need to go read that wonderful book again.
And, I don't know of any credible Bible scholar who believes that Ezekiel 38 has already occurred.
I personally take R.C. Sproul, Gary DeMar, Hank Hanegraaff, David Chilton, and the like to be credible Bible scholars. Many believe it was fulfilled with the Maccabees’ defeat of the Syrians. None of them believe Ezekiel is describing a future battle.
Here’s DeMar’ take regarding Esther:
“Ezekiel 34 states that God will act as Good Shepherd to Israel, and will bring them back into the land. He continues this theme in Ezekiel 36, saying that God will make a new covenant with Israel. The inauguration of this new covenant, which we can call the Restoration Covenant, is described in Zechariah 3, where God removes the filth from Joshua the High Priest and restores the Temple and Priesthood. . . . Ezekiel continues in Ezekiel 37 with the vision of the valley of dry bones. The Spirit of God would be given a greater measure than before (though of course not as great as at Pentecost in Acts 2), and the result would be restoration of the people. No longer would there be a cultural division between Judah and Ephraim, but all would be together as a new people. . . . At this point, Ezekiel describes the attack of Gog, Prince of Magog, and his confederates. Ezekiel states that people from all over the world attack God’s people, who are pictured dwelling at peace in the land. God’s people will completely defeat them, however, and the spoils will be immense. The result is that all nations will see the victory, and ‘the house of Israel will know that I am the Lord their God from that day onward’ (Ezek. 39:21-23). . . . Chronologically this all fits very nicely. The events of Esther took place during the reign of Darius, after the initial rebuilding of the Temple under Joshua [the High Priest] and Zerubbabel and shortly before rebuilding of the walls by Nehemiah. . . . Thus, the interpretive hypothesis I am suggesting (until someone shoots it down) is this: Ezekiel 34-37 describes the first return of the exiles under Zerubbabel, and implies the initial rebuilding of the physical Temple. Ezekiel 38-39 describes the attack of Gog (Haman) and his confederates against the Jews. Finally, Ezekiel 40-48 describes in figurative language the situation as a result of the work of Nehemiah.
“The slaughter of Israel’s enemies in Ezekiel 39 fits with the number of deaths listed in Esther 9:16 (75,000). In Esther 9:5 we read that ‘the Jews struck all their enemies with the sword, killing and destroying.’ Ezekiel 38:5-6 tells us that Israel’s enemies come from ‘Persia, Ethiopia [lit., Cush], and . . . from the remote parts of the north . . . ,’ all within the boundaries of the Persian Empire of Esther’s day. From Esther we learn that the Persian Empire ‘extended from India to Ethiopia [lit., Cush], provinces . . .’ in all (Esther 8:9). ‘In other words, the explicit idea that the Jews were attacked by people from all the provinces of Persia is in both passages. The parallels are unmistakable.”
Regardless, Ezekiel is clearly describing an ancient battle fought with ancient weapons and the reason for the invasion was to plunder silver, gold, and CATTLE.