Use an appropriate technique.
Your best bet is to stay on your feet and use striking techniques. Karate is one good choice - it was originally designed in the 1600’s for use by unarmed Japanese day care workers.
The ideal situation is fighting children who are trapped in a ditch below you.
You must avoid becoming surrounded at all costs. Keep moving, and always trying to position the bulk of children on one side of you.
You want this fight to be over fast. Children have boundless amounts of energy, and you’ll tire quickly as the fight progresses.
When taunting, remember that children are almost comically stupid, and won’t understand any of your more creative taunts.
I’d recommend lifting his body over your head and screaming yourself hoarse. That’s the smart veteran move.
By bringing a weapon you might prompt the children to bring weapons as well.
Let the last one walk away.