Gaius Julius Vindex (born ca.
 AD 25; died AD 68), of a noble Gaulish family of Aquitania given senatorial status under Claudius, was a Roman governor in the province of Gallia Lugdunensis.
 In either late 67 or early 68, he rebelled against Emperor Nero.
 Though the aims of his followers may be more complex, Vindex as a senator would have had the aim simply of replacing Nero with a better emperor.
 According to the historian Cassius Dio, Vindex "was powerful in body and of shrewd intelligence, was skilled in warfare and full of daring for any great enterprise; and he had a passionate love of freedom and a vast ambition" (Cassius Dio, 63.22.1-2).
 In order to gain support, he declared his allegiance to the then governor of Hispania Tarraconensis, Servius Sulpicius Galba, as the new emperor but the commander of the Germania Superior army, Lucius Verginius Rufus advanced against him.
 The battle between their two forces took place near Vesontio (modern Besançon).
 What occurred then is unclear but despite a meeting between Verginius and Vindex, the forces under Verginius seemed to have decided on a battle without orders.
 Desire for plunder and the weakness of Verginius as a commander are possible explanations.
 In the resulting battle Vindex was defeated and committed suicide.
The Battle of Pered, fought on 20–21 June 1849, was one of the battles which took place in the Summer Campaign of the Hungarian War of Independence from 1848 to 1849, fought between the Hungarian Revolutionary Army and the Habsburg Empire helped by Russian troops.
 The Hungarian army was led by General Artúr Görgei, while the imperial army by Lieutenant field marshal Julius Jacob von Haynau.
 After a several preliminary minor battles of the Hungarian and Austrian troops along the Vág river, in which the attacking Hungarians could not achieve a success, Görgei took the command of his troops, and after receiving reinforcements, at 20 June, put his troops to attack again towards West.
 Although the II.
 Hungarian army corps occupied in heavy fights the village of Pered, the other two corps (the III.
 and the VIII.)
 were unsuccessful, and could not advance.
 The angered Görgei removed the commander of the III.
 corps, General Károly Knezić because of his inactivity, and Colonel Lajos Asbóth, the commander of the II.
 corps who, in contrast to Knezić, was the only commander who successfully accomplished his duties.
 While Knezić's place was taken by Colonel Károly Leiningen-Westerburg, who was a great choice, Asbóth's place was taken by Colonel József Kászonyi, who was an explicitly bad choice.
 Haynau, who in the first day of the battle was moving the bulk of his troops to cross the Danube in order to start an attack on its southern bank, sent three of his corps, which were still on the northern bank, to repel the Hungarian forces.
 The two Austrian (II., IV.)
 and one Russian (Panyutin's) corps started their attack at 21 June, and forced the Hungarians to retreat from Pered and Zsigárd, which forced Görgei to order his troops to retreat from the battlefield.
The Battle of Marton or Meretum took place on approximately 22 March 871 at a place recorded as Marton, perhaps in Wiltshire or Dorset.
 According to the Anglo-Saxon Chronicle, the battle took place "about two months" after a prior loss to the Danes at the Battle of Basing, in which both sides suffered heavy losses.
 King Æthelred of Wessex and Prince Alfred fought against the Danes, who were possibly under the leadership of King Halfdan Ragnarsson, who had commanded many of the earlier battles that year.
 The Chronicle tells us that the forces were split in two and that the Danes were initially put to flight, but at the end of the day and after "much slaughter" the Danes remained masters of the field.
 Among the fallen was Bishop Heahmund.
The Battle of Bạch Đằng (Vietnamese: "Trận Bạch Đằng" , Chữ nôm: 陣白藤) was one of the greatest victories in Vietnamese military history.
 It was a battle between Đại Việt, commanded by Supreme Commander Trần Hưng Đạo, and the invading army of the Yuan dynasty, commanded by general Omar Khan.
 The Battle of Bạch Đằng was the last confrontation between Đại Việt and the Yuan dynasty.
 The battle took place at the Bach Dang River, near Ha Long Bay in present-day northern Vietnam.
 The battle was a tactical masterpiece of the same stature as the other battle at Bach Dang River.
The Battle of Blair Mountain was the largest labor uprising in United States history and one of the largest, best-organized, and most well-armed uprisings since the American Civil War.
 For five days in late August and early September 1921, in Logan County, West Virginia, some 10,000 armed coal miners confronted 3,000 lawmen and strikebreakers, called the Logan Defenders, who were backed by coal mine operators during an attempt by the miners to unionize the southwestern West Virginia coalfields.
 The battle ended after approximately one million rounds were fired, and the United States Army intervened by presidential order.
The Battle of Vác, fought on 10 April 1849, was one of the two important battles which took place in Vác in the Spring Campaign of the Hungarian War of Independence from 1848–1849, fought between the Habsburg Empire and the Hungarian Revolutionary Army.
 This battle was the starting point of the second phase of the Spring Campaign, which had the purpose of relieving the fortress of Komárom from the imperial siege, and with this to encircle the Habsburg imperial forces headquartered in the Hungarian capitals of Buda and Pest.
 The Hungarians won the battle, in which the Austrian commander Major General Christian Götz was fatally wounded, dying after the battle.
 His body was buried by the Hungarian high commander Artúr Görgei with military honors, this being one of the examples of gallantry and high respect for the fallen enemy hero in the Hungarian War for Independence.
The Battle of Nanyang took place in 1641 and 1642 in Nanyang, an important city in Henan Province.
 This city is an ancient original place of the Silk Road.
 At the end of Ming Dynasty, many battles took place in Nanyang.
 In 1641, a person named Li Zicheng "(李自成)" attacked Nanyang and finally took control of the west of this city.
 In 1642, he attacked Nanyang again and took control of the whole city.
 And that war was called Battle of Nanyang, which lasted nearly a year.
The Battle of Varja took place on November 7, 1700 close to at the villages of Varja and Aa, in the Swedish Empire during the Estonian campaign of the first year in the Great Northern War.
 A Swedish force consisting of 800 men under the command of generals Georg Reinhold Patkul and Hans Henrik von Tiesenhausen were sent out from Rakvere to secure the road at which the main army under Charles XII of Sweden were going in order to relief the city of Narva which had been besieged by the Russians for a while.
 At the villages of Varja and Aa they surprised a Russian force of 2,000 men from Boris Sheremetev's detachment gathering supplies for their army at Narva.
 The Russians were caught completely off guard and subsequently took cover within the houses to avoid the Swedish onslaught, these were however, soon put on fire by the Swedes, an action resulting in 1,500 Russians killed, wounded or captured to about 200 Swedes with only 500 Russians who managed to escape.
 Later during the day, as the Swedes were looting the Russian supplies, a larger force of 3,000 men under Sheremetev himself, arrived and in turn surprised the Swedes who were driven off with a loss of 80 men among them, the Swedish commander Georg Reinhold Patkul who was captured during the retreat.
 The Russians here received important information about the approach of the Swedish main army under Charles, who arrived at the two villages about two weeks later.
 Sheremetev would later face the Swedish vanguard at Pühhajoggi, however after initial skirmishes he was soon driven off leading to the battle of Narva where the Russian main army saw itself decisively defeated by the Swedish army.
The Battle of the Hills (French: "Bataille des Monts" ) also known as the Battle of the Hills of Champagne and the Third Battle of Champagne, was a battle of the First World War that was fought from April–May 1917.
 The French Fourth Army offensive against the German 4th Army was intended to be auxiliary to that of the "Groupe d'armées du Nord" (GAN, Northern Army Group) along the Chemin des Dames, in the Second Battle of the Aisne.
 General Anthoine, commander of the Fourth Army planned a supporting attack but this was rejected by Nivelle and Anthoine planned a frontal attack by two corps on an 11 km front, to break through the German defences on the first day and commence exploitation the following day.
 The battle took place east of Reims, between Prunay and Aubérive, in the province of Champagne, along the Moronvilliers Hills.
Don Chafin (June 26, 1887 – August 9, 1954) was the sheriff of Logan County, West Virginia and a commander in the Battle of Blair Mountain.
 As sheriff of Logan County, Chafin was a fierce opponent of unionization and received hundreds of thousands of dollars from coal mine operators in return for his violent suppression of the United Mine Workers union.

Question: Don Chafin was a commander in a battle that took place in which year ?
Answer: 1921