Most influential battle of all time

I got into a pretty good discussion with my sister the other day, and I am fascinated by the ways certain battles change history. In my opinion the Battle of Hastings and Stalingrad are the 2 most influential battles of all time. I had argued with her that I thought Stalingrad beat out Hastings, but barely. I knew there were many many reasons that Hastings could be the most influential, but I took Stalingrad, because it marked the decline of the German offensive on the Eastern Front. They lost 250,000 soldiers to death or capture. The Germans were instructed to fight to the death, but 90,000 surrendered, of which only 5,000 survived the conlusion of the war. The Germans launched another offensive later called Operation Citadel, which was a huge undertaking in which the battle of Kursk took place. For those who like tanks I would suggest researching about this battle. It is the largest tank battle ever. This offensive failed as well, and they were in retreat afterwards. After the defeat of Stalingrad, the Germans had to continue to send many men and supplies to the Eastern Front. If Stalingrad had been a victory for them, they could have used many of the men and supplies they were sending to the Eastern Front, to the Western Front, and this would have created much more difficulties for the Allies in the West. Their defense in the West could have been much more formidable with those extra troops and supplies, and the outcome of the Western Front could have been much different. I think Stalin's paranoia would also affect the Soviets, because if he lost the city named after him, I think serious heads would have rolled at the Kremlin. The Battle of Moscow is also a very significant battle on the Eastern Front as well, as that also stopped the German offensive. So in the end I barely pick Stalingrad over Hastings, based on my opinion that WW2 takes on a whole new outlook if the Germans are victorious there. I thought I would open up this forum for those who are intersted in listing what you might think the most influential battle of all time is and why. You can really go back as far as you want, and say if this battle hadn't occured and these people been victorious, then you never even would have had a Stalingrad, and I concur with that, but I think the Germans have a very good chance of controlling Europe if they win at Stalingrad. I won't steal any of the thunder one might have for all the reasons why Hastings is the most influential, but for those that pick Hastings and think I'm crazy, just remember I only picked Stalingrad by a hair over Hastings. So feel free to list your most influential battle of all time if you wish, and the reasons why.