How old are the kids?
I wouldn't take preteens to see that movie. It accurately portrays a firefight that left 18 Americans dead and dozens injured along with an estimated 1000 enemy dead. It's a very violent movie. You might start with a program on the History Channel tonight called "The True Story Behind Blackhawk Down". It doesn't detract from the movie. Instead, it provides more background information that should make the movie more understandable.