Babysitting a huge crowd, any philosophy?

so my moms comanding officer is getting a surprise b-day party tomorrow and one of the other officers hired us to babysit the kids. so were discussion about 11 or 12 kids here. (mostly girls) it's about a 3 hour gig and we don't want them surrounded by the house for the majority of the time (we just moved in so theres still ladders, and other tools lying around) what are some correct outdoor games we could play to keep them busy. (the age is about 1 to 6)
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