ESSAY- HEEELLLLLLLLLPPPPPPPPPP

ok...here's the thing, i need help on my essay intro, can u guys please give me pointers on my thesis, grammer, etc. This is formal essay:

"The Big Three Meet at Tehran" was the headline for several different newspapers in Allied Countries. Starting on November 28 1943 Joseph Stalin, Winston Churchill and Franklin Roosevelt met for four consecutive days in order to discuss future allied war efforts. The Tehran Conference (Codenamed Eureka Summit) was one of the first "Summit" conferences that would take place during World War Two; during the conference several militaristic decisions were made. Firstly, it was decided that after the war East Poland would be given to the Soviet Union. The fact that it would be favorable if Turkey joined with the Allies was also agreed upon. Even though the Conference discussed the future of Poland, Turkey's involvement in the war and the Partisans in Yugoslavia, the most significant accomplishment was the agreement for the Invasion of Normandy (Codenamed Operation Overlord, also known as D-Day) in June 6 1944. The American, British and Canadian troops commenced a five pronged assault on Normandy Beach. The objective of the operation was to capture a foothold on Germany which was accomplished on the same day. Operation Overlord was extremely important in the war for meeting with Stalin's demands, boosting public morale and for being the turning point in the war.