My daughter was slapped multiple times at the playground today by another toddler. Did I handle this the right way?

Hi all,I'm a work-from-home dad to a 2 year old daughter. We regularly visit a local playground so that she can get some exercise in and work on socializing and playing with other kids. Today was the first time there's been any kind of issue and I'm just wondering what ya'll think about the situation and the way I handled it.My daughter has proven to be a fast learner when it comes to sharing and taking turns and I know that other kids/parents may take longer to catch on to these kinds of things. So with that said, on to the tale.Today, my kid is patiently waiting in line to go up a monkey bar ladder and there's a group of 3 kids that are there with the same mom and/or caretaker. The oldest was around 4 or 5 and the youngest boy wasn't much more than 1 year old. As the one year old hops off the ladder, he goes over to my daughter and pushes her against the wall and starts slapping her in the face repeatedly, then starts poking her in the eyes. For a brief moment, I just watched, dumbfounded. He looked like he was just blocking her up against the ropes like a crafty old boxer and was working in a couple shots while the ref wasn't looking.My daughter was completely caught off guard by it too and she finally looked over at me and started bawling. By then I had made it over to the ladder and I caught the little boys arm and said 'Whoa no slapping buddy, slapping is not okay. No slap, No slap'. I'm aware he probably had no idea what I was saying but I didn't yell or take any kind of an aggressive tone. The little guy is still really young and I'm sure he doesn't really have much playground experience under his belt. I was really just worried about getting my daughter back in a good mood so we could enjoy the rest of the time there.The mom and/or caretaker of the little boy came over and snatched the boy up and took him over to a bench where she appeared to give a brief reprimand then she high-tailed it out of the park.I guess my main question is, did I overstep any boundary with my actions? I'm still learning on the job here and haven't ever encountered anything like this. I've lurked on this sub for quite a while and have gained alot of knowledge from thoughtful comments and conversations here and am wondering if there was perhaps something I should've or should not have done in this scenario. via /r/Parenting http://ift.tt/2wc030x