I think you go on the offensive at first. You need to charge one of the weak looking ones and just plow him/her down and whoever i around. Then, do as others have said. Pick the short one up, and either throw or swing it at the others.
That would only work for so long though I think. You would have to drop the kid at some point. That is when it gets used as a shield. As you shove some away, try to pile a couple up around you. They are short after all, it doesn't take much to make then slow down by making them have to climb over a few bodies. That is when you pop them in the face/throat, or use another kid head to smack against theirs.
i'd want to dress like a ninja if i did this i'd want to be quick on my feet. plus i'd want to wear a black headband. it'd make me feel more like a weapon of death if i got to wear a black headband. then it'd be on till the mutha****ing break of dawn. i would scream out random words like "Piss!"..."Doom"..."****"...."Shit"..."Rip".
you need to take your knee and drive it into their faces. easy outs. that's it. knee to the face and they're done. i'd concentrate on shoving them down too. so knee to the face, push as many as i can to the floor to buy me some time, then haymakers, you could probably hit 2 kids if you're good enough. then you catch your breath by pushign as many as you could to the floor.
100 kids. the only thing that could stop you would be your stamina.
also, keep in mind - they might be tiny warriors, but they are only 5 years old, if you hit them hard enough they'll cry. so you could even smack a lot of kids to catch your breath.
then Mr. Knee will put them to bed once they stop to cry. you don't know how bad i want to fight 5 year olds now. i would pay a lot of money to be in this scenario. i would love to beat the shit out of tiny humans. i would rip and tear. i could envision myself losing my humanity for the required time to **** these kids up. i'm talking blind bloodlust. i'm talking taking a kid and ripping its jaw off. i just got this sudden urge to ****ing **** shit up. you don't understand, i'm sitting here knowing that if i was in that situation, i could get the ability to take a tiny 5 year old neck and squeeze it.