The Normandy Landings in World War 2 were pretty brutal, especially Utah and Omaha Beach fronts, June 6 1944. You could also read up on the Holland Invasions, also known as Operation: Market Garden, this was a massive faliure for the allies, both these examples are good if you are looking a WWII.

I am a student studying gas masks for a very important assignment. I was wandering if any of you guys know much about them? I am interested in their uses in the wars.