Everything what I read here is unhistorical - to say it gentle...
1. Karl der Große (Charlemagne) wasnt French, he was a Frank: the name France comes from the germanic tribe of the Franken
2. To talk about Germany and France in this time is simply a joke. nationbuilding began more than 200 years later
3. they watched the Romans building a bridge and then they ran away? Dont take it personal, but this article isnt about Britain - witch was invaded as Gallien was. The Romans where overruled by trying to invade "Germania" more than 3 times. The building of the colonies Germania magna and Germania inferior was more to make some good propaganda in Rome, cause the main population was there was Celtic, and the Germanic people there where new settlers looking for new ground. 
4. There is no Germany till 1871. Till that days Germany was splitted into 39 states, before 1815 into the unbelievable amount of more than 200 states. The states where fighting more each other than the foreign states, and so every invasion made by foreign nations was made with the help of some German states against some others.
5. What about the 30 years of war 1518- 1548, where the half of the population died? I know that you are obsessed with WWI and WWII but the history of Germany is mutch longer than that.
6. Austria and Germany where part of the holy roman empire of the German nation, and its unhistorical to devide them from Germany till the year of 1871
7. I know you will hate the idea, but when you take all of this together you have to write 200 German war- historys (Brandenburg, Sachsen, Hessen, Bayern, Schlesien, Hanse- cities...) till 1871, and from that day on you can begin your article
8. Its better to end this project; or start it 1871.