Muslims will use the weapons of Yuʾjūj Maʾjūj after they're eliminated
"The Muslims will use the bows, arrows and shields of Gog and Magog as firewood, for seven years.'"
قَالَ رَسُولُ اللَّهِ ﷺ سَيُوقِدُ الْمُسْلِمُونَ مِنْ قِسِيِّ يَأْجُوجَ وَمَأْجُوجَ وَنُشَّابِهِمْ وَأَتْرِسَتِهِمْ سَبْعَ سِنِينَ