Question: Gorgidas was the first known Theban military leader of of troop of select soldiers annihilated in what battle?
Context: Li Shixian () (b. 1834 - d. 23 August 1865) was a pre-eminent military leader of the late Taiping Rebellion.  He was the cousin of military leader Li Xiucheng and was known for being very tall for a native of Guangxi province, standing at 2 m tall.  During his military tenure, he was given the title of King of Shi (侍王) (meaning "Servant Prince").  In the latter part of the Taiping rebellion, he led Taiping forces to many military victories.  Later in his life, he invited an aging Wei Yuan to live in his home and was known to hold counsel with the famous scholar.  He was eventually assassinated by a traitor in Guangdong. Chen Huancheng (1776-1842) was a 19th century military leader of Qing Dynasty China.  He served as the provincial military leader in Jiangnan Province before being killed in the First Opium War. Marcus Claudius Marcellus ( ; c. 268 – 208 BC), five times elected as consul of the Roman Republic, was an important Roman military leader during the Gallic War of 225 BC and the Second Punic War.  Marcellus gained the most prestigious award a Roman general could earn, the spolia opima, for killing the Gallic military leader and king Viridomarus in hand-to-hand combat in 222 BC at the battle of Clastidium.  Furthermore, he is noted for having conquered the fortified city of Syracuse in a protracted siege during which Archimedes, the famous inventor, was killed.  Marcus Claudius Marcellus died in battle in 208 BC, leaving behind a legacy of military conquests and a reinvigorated Roman legend of the "spolia opima". The Battle of Tegyra (375 BC) (also known as the Battle of Tegyrae) was an ancient Greek battle between Theban and Spartan hoplite forces.  In the battle, a Theban army under Pelopidas was challenged by a substantially larger Spartan force while retreating from an abortive attack on Orchomenus, but successfully attacked and routed the Spartans.  The battle marked the first occasion in the historical record in which a Spartan force had been defeated by a numerically inferior enemy in a set battle (as opposed to irregular warfare, employed by Iphicrates). Titus Lucretius Tricipitinus was a politician and military leader in the early days of the Roman Republic.  Twice, in the years 508 and 504 BC, he was elected Roman Consul, alongside Publius Valerius Poplicola.  Also a military leader, he was victorious against Lars Porsenna during his first consulate.  According to Livy, he led the Roman army together with Valerius against the Sabines in 504 BC and both consuls were awarded the honour of a triumph, however the Fasti Triumphales only mention the triumph of Valerius, in May 504 BC. Bogomer from the kindred Ludány (Hungarian: "Ludány nembeli Bogomér" ; died around 1245/54) was a Hungarian military leader and nobleman in the first half of the 13th century, who was the first known Count of the Székelys, serving in this capacity around 1228. The Sacred Band of Thebes (Ancient Greek: Ἱερὸς Λόχος , "Hieròs Lókhos") was a troop of select soldiers, consisting of 150 pairs of male lovers which formed the elite force of the Theban army in the 4th century BC.  Its predominance began with its crucial role in the Battle of Leuctra in 371 BC.  It was annihilated by Philip II of Macedon in the Battle of Chaeronea in 338 BC. Daniël Johannes Stephanus "Danie" Theron, (9 May 1872 - 5 September 1900) was a Boer Army military leader.  Born in Tulbagh, Cape Colony, he was raised in Bethlehem, Orange Free State.  He is best known as the driving force behind the formation of a military bicycle corps used by the Boer Army for scouting and relaying messages.  Originally trained as a school teacher, he became a lawyer and notary with his own law firm in Krugersdorp, Transvaal Republic, and was made a Captain in the Boer Army when the Second Boer War began.  During the war, he was put in charge of a significant scouting unit, the "Theron se Verkenningskorps (TVK)" (Theron Reconnaissance Corps).  He fought at the Battle of Paardeberg and one of his most famous feats occurred at the Battle of Spion Kop.  The British Commander in Chief, Lord Roberts, called Theron: "the hardest thorn in the flesh of the British advance", put a reward of £1,000 on his head - dead or alive, and dispatched 4,000 soldiers to find and eliminate the TVK. Lucius Minicius Natalis Quadronius Verus (Barcino, AD 97 – ?)  was a Roman statesman and military leader who served as the Proconsul of Africa from 153 to 154.  He was the first known Olympic champion to have been born in the Iberian Peninsula. Gorgidas (Ancient Greek: Γοργίδας) was the first known Theban military leader of the Sacred Band of Thebes around 378 BC.
Answer: the Battle of Chaeronea