Modern Warfare and Avatar The Last Airbender is a crossover fanon by Crazautiz. It take place in both the Avatar The Last Airbender and Call Of Duty 4: Modern Warfare universes, consisting of 3 chapters
The storyline takes place between Day of Black Sun and Sozin's Commet. Two lone Firebenders have attacked a Marine Force Recon base in the Southern Air Temple which caused them to enter the war. They first started with the entrance to the Fire Nation (as did the Earth Kingdom and Water Tribes), then proceeded to the Fire Nation Capital. After the fighting ended, the forces returned home and the story ends.