Hi, I have had time to read the whole thread now and I have to say i am even more worried for you and especially for your children than I was before.
I am mystified as to why the police had such a minimal response and why Children's Services did not come out straight away, but i appreciate that different local authorities may repond differently at times. Or perhaps Children's Services were not initially made aware of just how involved the children were in this incident.
The fact that your children tried to intervene and your husband was aggressive with them is a huge concern. Your children are at risk from him and that risk needs to be managed very carefully. Physical violence against children (even if it is unintended e.g. a child gets between a father attacking a mother in teh hope to protect their mother) in teh worst case seanrio can result in teh death of that child. You may think this sounds like scare mongering, but if he hit you, a grown woman, in the face, hard enough to knock you out, what would that strike have done to a child's face/skull/brain?
Additionally (as so many peoepl on this thread have testified) children who grow up in violent households where their parents stay together have a life time of pain ahead of them, even if they are never the subject of that violence. The terror of watching their mothers being abused is enough to cause life long emotional and psychological scars!
As there have been so many women sharing their stories I will not comment on the effect of domestic violence on little girls, but as there tend to be few men on this board I will say that in my experience one of the terrible ironies for boys who grow up with violent fathers is that as much as they abore watching their mothers being abused, they can often (not always) repeat the patterns of abuse in their own adult relationships. One of the very (many) upsetting aspects of my job is seeing teh very sad, scared little boys who have spent their childhoods worrying about and trying to protect their mothers, becoming aggresive boyfriends as they reach teenage and adulthood. (please do not think I am trying to excuse their actions, I am only trying to illustrate just how destructive ongoing domestic violence is for children).
The best thing you can do now is ensure that your husband never lives with your children again. Be very honest with Children's Services, please do not try to cover for your husband.
This is a Child Protection issue and Children's Services will need to be sure that you understand the risks that he poses to the children and that you are willing to take the steps necessary to protect them (this basically means ending your relationship with him and not letting him back in your home). I really do not want to scare you, but if you cannot recognise the risks he poses to your children questions will be raised about whether they will be safe in your care. In so many cases it really does come down to a mother picking her partner or her children, it is heart breaking to se how many pick the partner. From everything you have written so far I am sure you will not do that, but it does seem that you need to be a little more honest with yourself about exactly how your husband has been treating you and yoru children.
Sorry this is so long, I am just so worried for you and your children!