NSFW. Was it abuse for my then husband to spank our seventeen year old daughter?

I don’t know why I have to get myself all worked up about things that are over, that happened three decades ago. But when my daughter was fifteen my then husband popped her on top of her jeans once in a rage. Then when she was seventeen or eighteen he did it again on top of her clothes. Was this sexual abuse? He had and has a violent temper and she’s bipolar in everyone’s opinion. I kept out of it. I was scared of him but couldn’t imagine life without him.