Family violence

Respected scholars, as-salamu `alaykum. When a husband hits his wife, what can she do to protect herself and her children, who have to witness this? What does Islam say about this? Jazakum Allahu khayran.

assalamualaikum...eru humbly i would like to ask u that can i husband beat his wife when she disrespects him or disobey him but if a husband commits a sin a wife cannot say any thing to her?she cant beat him cant yell at him?if she doesnt fight with her huband whom else with does she fight.plz tell me the rights of a wife in this matter.coz my husband always threaten me that i can beat u any time but being a wife u cant do any thing to me