According to the Ahadith of Hazrat Muhammad P.B.U.H Before the arrival of Dajal(Liar).There will be a greatest war among the believers and non-believers.

(1) FIRST HADEES OF HAZRAT ABU HURAIRAH (R.A.)

The very first Hadees is related to Hazrat Abu Hurairah (R.A.). He says that my intimate friend Hazrat Muhammad (P.B.U.H.) told me that: “ In this Ummah, the troops would be headed towards Sindh & Hind”

(2) HADEES OF HAZRAT SUBAN(R.A.)the freed servant of Hazrat Muhammad(P.B.U.H.) :-It is being related to Hazrat Suban(R.A.), that Hazrat Muhammad(P.B.U.H.) told that;“ Two groups amongst My Ummah would be such, to whom Allah has freed from fire; One group would attack Hind & the Second would be that who would accompany Isa Ibn-e-Maryam(A.S)Explanations:Ghazwa-E Hind:The first group of people would be from Khurasan who will attack Hind,they would capture Hind and would arrest the rulers of Hind in chains. After fatha,they would join Hazrat Imaam Mahdi
After taking bait on the Hands of Hazrat Imaam Mehdi(A.S)in the Hajj,they would go to shaam for Jihad and protection of Shaam(Present day Syria+Iraq) the best people would be in their company. Meanwhile during their Jihad they would listen about the appearance of Fitnah e Dajjal(The biggest liar),their would be killings and wars and clashes and huge fitnah around the world.After Huge Fitnah Hazrat Essa Ibn-e Maryam(A.S) would appear in Makkah. All the people would join him they would take bait on the Hands of The biggest Savour Hazrat Essa(A.S). They would defeat and kill Dajjal. They would wash out the fitn from world and there would be 40years of peace around the world and this would be the best ever time.
ALLAH O AKBAR