We recently read Story of the World Volume 2 chapters 11 and 13 about the Franks and had a lot of fun learning and re-enacting. After reading the chapters we decided to use the tent of spoils activity mentioned in the activity guide. I explained the concept of pillaging to the kids and sent them to one of their bedrooms to set up their tent. I hid a bunch of treats (granola bars, fruit snacks, and such) around the living room Easter-egg-hunt style. When I told them everything was ready they came galloping in as the Muslim army ready to attack the city of Tours--Jake on the stick horse he made a few months ago, and Abby riding on her stuffed dog.
After that Cameron told the kids to mount their horses and gallop into the kitchen for a somewhat Frankish dinner--crepes--where we discussed together what Charlemagne accomplished and why it did (or didn't) work so well.
Hopefully the kids came away from all this with a better understanding of Charlemagne's reign. Time will tell. In the mean time, they did decide that crepes are a delicious dinner option!