I can go into detail why the islam culture wil never work with any other culture. But i wil spare you a boring read. I understand why you wanted to help the woman. But to be frank the only thing you could have done was calling the police and let them hear what is happening. Because the woman in islam are not worth anything, it is a commodoty that a man can do with what they want. But if the police hears the beating they can lock him up.
If you wanne learn more about islam and there faith / political system i advice you to read the koran, hadith, sunah. These are the 3 most importad books in there religion. And it wil open your eyes. Because most people only know about the koran, but the hadith is the life of there profet and a example on how they should live. And that is the book that tells them that if a woman disabeys they can hit here, but not in the face and not break there bowns.
In fact, I wasted my time in reading quran, hadith and sunah. I spend whole nights discussing and arguing with several imams from Duesseldorf and Wuerzburg. This did not enlighten me, or gave me a moral understanding that is more plausible to me in any way than what I knew before. I also read the bible (I can't say anything better about the old testament). The biggest problem I see about Islam is, that you cant really divide politics from religion, because Islam is political to its core. What happened in Western Civilisations (separation of church and state, which is still in process for 200 years now) can't really happen with islam.
Btw. police will do shit, if the woman isn't willing to lay charges on her husband.
Thats the beauty of letting police hear or see it. The woman does not need to press charges the police can do it themself as a witness
In Germany ... not. SHE has to press charges, else nothing will happen.
Additionally they take up to 30 min until they arrive.
that sucks