Q: If Imam Mehdi (AHS) came & departed, who will fight Dajjal & Yajuj/Majuj?

Answer:  Hazrath ISA (AHS) will fight with Dajjal. With regards to Yajuj/Majuj, Allah (SWT) will have them bitten by an insect (naghaf) ant then they will die.

 Answer provided by

- Hazrath Peer-o-Murshid Mufti Syed Zameer Mahdi