what ws the battle with byaznaitnes which made muslims religon mainstream

The battle you’re probably thinking of is the Battle of Yarmouk in 636 CE, where Muslim forces defeated the Byzantine army and helped secure Muslim control of the Levant. It was one of the turning points in the early Muslim conquests, but Islam became mainstream through a longer process, not one single battle.

What happened

Yarmouk was fought near the Yarmouk River, and it ended Byzantine rule over much of Syria-Palestine. That victory opened the way for further Muslim expansion into other Byzantine territories, especially Egypt. Earlier clashes like the Battle of Mu’tah were important too, but Yarmouk is usually seen as the decisive one.

Why it matters

• It showed that the new Muslim state could defeat a major empire in open battle.

• It weakened Byzantine control in the eastern Mediterranean.

• It helped the early Muslim community grow from a regional power into a major empire.

Simple answer

So the short answer is: Yarmouk. If you want, I can also explain it in very simple terms or give you a one-paragraph history version.