the problem is, that it was never really won, and never really over. There was a truce, with Israel coming out on top. Until the fighting started up again, and again…
But I guess, it is like chanuka, which came after a specific series of battles was won, although the war restarted and continued for many years.
If we follow Chanuka’s example, when the day of celebration was when the Beis Hamikdash was re-dedicated, we should find a day of spiritual significance connected to the battles- maybe regaining the kosel in 1967 and being able to daven there? So it would be Yom Yerushalayim. And if you move it over several days, it is 3 Yimei Hagbala and no sefira issues for all deos.
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