Question: Vladmir Filatov was able to save the eyesight of sniper Vasily Zaytsev during what battle?

full_context: Document 1: Snipers of the Soviet Union: Snipers of the Soviet Union played an important role mainly on the Eastern Front of World War II, apart from other preceding and subsequent conflicts. In World War II, Soviet snipers used the 7.62×54mmR rifle cartridge with light, heavy, armour-piercing (B-30), armour-piercing-incendiary (B-32), zeroing-and-incendiary (P3), and tracer bullets. Most Soviet World War II snipers carried a combat load of 120 rifle cartridges in the field. Unlike the militaries of other nations, these snipers could be men or women. In 1943, there were over 2,000 women functioning in this role.
Document 2: Ilham Zakiyev: Ilham Azizaga oglu Zakiyev (Azerbaijani: "İlham Zəkiyev" , born 3 March 1980, Sumgayit) is an Azerbaijani blind judoka. He began studying judo when he was 11 years of age. In 1998, when he was 18, he went to serve in Azerbaijani army in the Aşağı Əbdürrəhmanlı village of Fizuli Rayon. He served on the frontline of the conflict zone. On 4 February 1999, he was wounded by a bullet to the head by an Armenian sniper, while on a combat mission. The bullet passed through the entire head, entering from the left and exiting via the right temple. As a result, Zakiyev has completely lost his eyesight. After a long rehabilitation he returned to the sportç but as a Paralympian. He is the holder of a 6-dan black belt.
Document 3: Erwin König: Erwin König and Heinz Thorvald are names of an apocryphal Wehrmacht sniper allegedly killed by the Soviet sniper Vasily Zaytsev during the Battle of Stalingrad.
Document 4: Vladimir Sharpatov: Vladimir Ilyich Sharpatov (Russian: Влади́мир Ильи́ч Шарпа́тов , born March 21, 1940, Krasnogorkiy village of Zvenigovsky District, Mari El) is an airplane pilot and Hero of the Russian Federation (1996). An Ilyushin Il-76 cargo plane under his command made a forced landing at the airfield near Kandahar, Afghanistan, in August 1995. All 7 Russian nationals on board were subsequently held captive by the Taliban for a year until they successfully escaped by flying their own plane out of Afghanistan in August 1996. Russian actor Alexander Baluyev played Vladimir Sharpatov in the 2010 film Kandagar.
Document 5: Lyudmila Pavlichenko: Liudmyla Mykhailovna Pavlychenko (Ukrainian: Людмила Михайлівна Павличенко , Russian: Людмила Михайловна Павличенко ; July 12, 1916October 10, 1974) was a Ukrainian Red Army Soviet sniper during World War II. Credited with 309 kills, she is regarded as one of the top military snipers of all time and the most successful female sniper in history.
Document 6: Vladimir Filatov: Vladimir Petrovich Filatov (Russian: Владимир Филaтoв , 15 [O.S. 27] February 1875, Mikhaylovka, Penza Governorate, Russian Empire - 30 October 1956, Odessa, Ukrainian SSR) was a Russian and Ukrainian ophthalmologist and surgeon best known for his development of tissue therapy. He introduced the tube flap grafting method, corneal transplantation and preservation of grafts from cadaver eyes. He founded the Institute of Eye Diseases & Tissue Therapy in Odessa, Soviet Union (today Ukraine). Filatov is also credited for restoring Vasily Zaytsev's sight when he suffered an injury to his eyes from a mortar attack during Battle of Stalingrad.
Document 7: Simo Häyhä: Simo "Simuna" Häyhä (] ; 17 December 1905 – 1 April 2002), nicknamed ""White Death"" (Russian: Белая смерть , "Belaya Smert" ; Finnish: "valkoinen kuolema" ; Swedish: "den vita döden" ) by the Red Army , was a Finnish sniper. According to western sources, using a Finnish-produced M/28-30 rifle (a variant of the Mosin–Nagant rifle) and the Suomi KP/-31 submachine gun, he is reported as having killed 505 men during the 1939–40 Winter War, the highest recorded number of confirmed sniper kills in any major war. However, Antti Rantama (Häyhä's unit military chaplain), credited 259 confirmed sniper kills were made by Simo Häyhä during the Winter War. Häyhä wrote in his diary, found in 2017, that he killed over 500 Soviet soldiers (by both sniper rifle and machine/submachine gun).
Document 8: Enemy at the Gates: Enemy at the Gates is a 2001 French-American war film written and directed by Jean-Jacques Annaud and based on William Craig's 1973 nonfiction book "", which describes the events surrounding the Battle of Stalingrad in the winter of 1942 and 1943. The film's main character is a fictionalized version of sniper Vasily Zaytsev, a Hero of the Soviet Union during World War II. It includes a snipers' duel between Zaytsev and a "Wehrmacht" sniper school director, Major Erwin König.
Document 9: Klavdiya Kalugina: Klavdiya Kalugina (born 1926) was a Soviet sniper in the Second World War. She joined the Communist Youth league Komsomol in 1943 where she qualified as a sniper. She entered active service at age 17 in March 1944, fighting on the 3rd Belorussian Front as one of the youngest women snipers. She has 257 confirmed kills.
Document 10: Trofim Kolomiets: Trofim Kolomiets (1894 – April 1971) was a Soviet corps commander. He was born in what is now Kropyvnytskyi, Kirovohrad Oblast, Ukraine. He fought in the Imperial Russian Army during World War I before going over to the Bolsheviks in the subsequent civil war. At the beginning of the Great Patriotic War, he was a major general. He fought against the forces of the Axis powers at Smolensk and Stalingrad.
Document 11: Leonid Filatov: Leonid Alekseyevich Filatov (Russian: Леони́д Алексе́евич Фила́тов ; ] ; 24 December 1946 – 26 October 2003) was a Soviet and Russian actor, director, poet, pamphleteer, who shot to fame while a member of troupe at Taganka Theatre under director Yury Lyubimov. Despite severe illness that haunted him in the 1990s, he received many awards, including the Russian Federation State Prize and People's Artist of Russia in 1996.
Document 12: Gustavo Tamayo: Gustavo E. Tamayo is a Colombian ophthalmologist known for developing a refractive surgery method known as Contoured Ablation Patterns (CAP), which enables doctors to make surgeries faster and at an easier rate. Tamayo has also developed and patented a procedure to treat presbyopia, which is at the moment being tested by AMO (Abbott Medical Optics) in order to massively apply this procedure in a global manner once approved by the FDA. He also has other patents dealing with cataract removal through laser application. Dr. Tamayo was designated subdirector of the Subspecialty Refractive Surgery Day at American Academy of Ophthalmology meeting in 2008 which took place in Atlanta and was appointed director for the same meeting in its 2009 edition. He is the president and founder of a surgical eye clinic in the north of Bogotá founded in 2001 called Bogota Laser Ocular Surgery Center. Dr. Gustavo E. Tamayo, M.D. also serves as a Member of the Medical Advisory Board at AMO, Presbia, Keramet and currently serves as the Medical Director for Latin America of Avedro. Dr. Tamayo is a member of various medical associations, including the American Academy of Ophthalmology, The Cornea Society, and both the American and European Societies of Cataract & Refractive Surgery.
Document 13: Semyon Nomokonov: Semyon Danilovich Nomokonov (12 August 1900 – 12 June or 15 July 1973) was a Soviet sniper during World War II, credited with 367 kills, recorded in his sniper log. An ethnic Buryat-Mongolian Hamnigan Evenk, Nomokonov was among the indigenous peoples of Russia who fought in the war. He received the nickname Taiga Shaman from the enemies.
Document 14: Nil Filatov: Nil Fyodorovich Filatov (Russian: Нил Фёдорович Филатов , 2 June [O.S. 21 May] 1847 , or 16 April [O.S. 4 April] 1847 , – 8 February [O.S. 26 January] 1902 ) was a physician who is considered the founder of Russian paediatrics. His nephew Vladimir Filatov was a prominent ophthalmologist.
Document 15: Vasily Zaytsev: Vasily Grigoryevich Zaytsev; 23 March 1915 – 15 December 1991) was a Soviet sniper and a Hero of the Soviet Union during World War II. Prior to 10 November, he killed 32 Axis soldiers with a standard-issue rifle. Between 10 November 1942 and 17 December 1942, during the Battle of Stalingrad, he killed 225 enemy soldiers, including 11 snipers.
ground_truth: Battle of Stalingrad