Yom Nicanor celebrated the victory of Yehuda Maccabi (a few years after the events commemorated on Chanuka) over Nicanor, the Syrian-Greek governor who threatened to destroy the Temple if he wasn't handed over Yehuda Maccabi and his followers as prisoners. This celebration is recorded in Megillat Taanit and is among the many listed there which were subsequently nullified.
While it was practiced, was Hallel recited on that day?
If it was, what about in these days, after Megillat Taanit was nullified? I know that usually, Yom Nicanor is displaced by the Fast of Esther. But in years (such as 2013 / 5773) when the Fast of Esther is displaced due to Shabbat, may Hallel be said on the 13th of Adar, [Yom Nicanor]?