We did a WW2 study a couple months ago before we went on a field trip to a Hitler's Eagle's Nest. We have 9yr and 6yr old boys. I, like you, had a hard time finding something that would keep their interest and also be appropriate for their age.
We did the WW2 Project Pack from Handsofachild.com and the boys made a lapbook while they learned about key features in the war. The project pack is chalked full of info, I just picked and chose what we did - we didnt do the whole thing. They really enjoyed that! I also found some good videos on Youtube (no less) called "WW2 in color" (or if you search for something around that name). Each one is just a few minutes long so it kept their attention and we would watch just one or two a day. And at the end of our study, we watched Sound of Music

mainly because it was filmed in the region of Germany we were going but also because it's a good family film with some WW2 reference in it

I hope that helps some, we had a great time doing our study together. I hope you do as well.
