Question: Gorgidas was the first known Theban military leader of of troop of select soldiers annihilated in what battle?

full_context: Document 1: Grabos: Grabos (Latin: "Grabus" ; ruled c. 358–356 BC) was the king of the Grabaei, a minor tribe in Illyria, located somewhere in what is today the northern half of Albania. According to Hammond, Grabos belonged to the royal house of the Grabaei, although the tribe may have been incorporated into the Taulantii realm of which Grabos became king. Hammond believes that Grabus, the Taulantii ruler, was his ancestor. After Philip II of Macedon defeated Bardylis (358 BC), the Grabaei under Grabos became the strongest state in Illyria. Philip II had killed 7,000 Illyrians in a great victory and annexed the territory up to Lake Ohrid. Very soon after the presumed alliance between the Chalkidians (Paeonian king Lyppeius and Thracian king Cetriporis) and Grabos in Athens in midsummer 356 BC, Grabos was defeated by Macedonian general Parmenion. The said alliance was found in a fragment at Olynthus, in unfinished state and thrown into a riverbed suggesting that it was never ratified. No more is heard of him.
Document 2: Stesicles: Stesicles was an Athenian general sent in 373 BC with a force of some 600 targeteers to aid the democratic party at Corcyra against the Spartans under Mnasippus. A more effective armament of 60 ships, with Timotheus for commander, was to follow as soon as it could be got ready. Meanwhile, Stesicles, with the assistance of Alcetas I of Epirus, effected an entrance into the town under cover of night. Here he reconciled the dissensions of the democratic party, united them against the common enemy, and conducted that series of successful operations, which ended in the defeat and death of Mnasippus, and the withdrawal of the Spartan fleet even before the arrival of Iphicrates, who had superseded Timotheus . There can be no question as to the identity of the Stesicles of Xenophon with the Ctesicles of Diodorus. But the latter writer tells us that Ctesicles had been sent sometime before to Zacynthus, to take the command against the Spartans of the Zacynthian exiles, whom Timotheus had restored. Johann Gottlob Schneider would reconcile the two authors by supposing that he was ordered to proceed from Zacynthus to Corcyra, nor does this seem so inconsistent with the language of Xenophon as Connop Thirlwall and Carl Rehdantz represent it.
Document 3: Philip II of Macedon: Philip II of Macedon (Greek: Φίλιππος Β΄ ὁ Μακεδών , "Phílippos II ho Makedṓn"; 382–336 BC) was the king (Basileus) of the Ancient Greek kingdom of Macedon from 359 BC until his assassination in 336 BC . He was a member of the Argead dynasty of Macedonian kings, the third son of King Amyntas III of Macedon, and father of Alexander the Great and Philip III. The rise of Macedon during the reign of Philip II was achieved in part by his reformation of the Ancient Macedonian army, establishing the Macedonian phalanx that proved critical in securing victories on the battlefield. After defeating Athens and Thebes at the Battle of Chaeronea in 338 BC, Philip II led the effort to establish a federation of Greek states known as the League of Corinth, with him as the elected hegemon and commander-in-chief of a planned invasion of the Achaemenid Empire of Persia. However, his assassination led to the immediate succession of his son Alexander, who would go on to invade the Achaemenid Empire in his father's stead.
Document 4: Olorus: Olorus (Greek: Ὄλορος) was the name of a king of Thrace. His daughter Hegesipyle married the Athenian statesman and general Miltiades, who defeated the Persians at the Battle of Marathon in 490 BC. Olorus was also the name of the father of the 5th century BC Athenian historian Thucydides, the author of the "History of the Peloponnesian War".
Document 5: Cardia (Thrace): Cardia (in Greek Kαρδία), anciently the chief town of the Thracian Chersonese (today Gallipoli peninsula), was situated at the head of the Gulf of Melas (today the Gulf of Saros). It was originally a colony of the Milesians and Clazomenians; but subsequently, in the time of Miltiades (late 6th century BC), the place also received Athenian colonists, as proved by Miltiades tyranny (515–493 BC). But this didn't make Cardia necessarily always pro-Athenian: when in 357 BC Athens took control of the Chersonese, the latter, under the rule of a Thracian prince, was the only city to remain neutral; but the decisive year was 352 BC when the city concluded a treaty of amity with king Philip II of Macedonia. A great crisis exploded when Diopeithes, an Athenian mercenary captain, had in 343 BC brought Attic settlers to the town; and since Cardia was unwilling to receive them, Philip immediately sent help to the town. The king proposed to settle the dispute between the two cities by arbitration, but Athens refused. The town was destroyed by Lysimachus about 309 BC , and although it was afterwards rebuilt, it never again rose to any degree of prosperity, as Lysimachia, which was built in its vicinity and peopled with the inhabitants of Cardia, became the chief town in that neighbourhood. Cardia was the birthplace of Alexander's secretary Eumenes and of the historian Hieronymus.
Document 6: Immortals (Achaemenid Empire): The Immortals (from the Greek Ἀθάνατοι "Athánatoi") also known as the Persian Immortals or Persian Warriors was the name given by Herodotus to an elite heavily-armed infantry unit of 10,000 soldiers in the army of the Achaemenid Empire. This force performed the dual roles of both Imperial Guard and standing army. The force consisted mainly of Persians, but also included Medes and Elamites. Essential questions regarding the unit (even its native name) remain unanswered, because authentic sources are missing.
Document 7: Hoplite: Hoplites were citizen-soldiers of Ancient Greek city-states who were primarily armed with spears and shields. Hoplite soldiers utilized the phalanx formation in order to be effective in war with fewer soldiers. The hoplites were primarily represented by free citizens—propertied farmers and artisans—who were able to afford the bronze armour suit and weapons (estimated at a third to a half of its able-bodied adult male population). Hoplites were not professional soldiers and often lacked sufficient military training. Although some states did maintain a small elite professional unit, hoplite soldiers were relied on heavily and made up the bulk of ancient Greek armies of the time.
Document 8: Battle of Tegyra: 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).
Document 9: Simmias of Thebes: Simmias of Thebes (Greek: Σιμμίας Θηβαῖος ; fl. 5th–4th century BCE) was an ancient Greek philosopher, disciple of Socrates, and a friend of Cebes. In his "Memorabilia", Xenophon includes him in the inner circle of Socrates' followers. He appears in Plato's "Phaedo" as a main discussion partner of Socrates alongside Cebes, as well as "Crito", "Phaedrus", and "Epistile" "XIII".
Document 10: Battle of Thermopylae: The Battle of Thermopylae ( ; Greek: Μάχη τῶν Θερμοπυλῶν , "Machē tōn Thermopylōn") was fought between an alliance of Greek city-states, led by King Leonidas of Sparta, and the Persian Empire of Xerxes I over the course of three days, during the second Persian invasion of Greece. It took place simultaneously with the naval battle at Artemisium, in August or September 480 BC, at the narrow coastal pass of Thermopylae ("The Hot Gates"). The Persian invasion was a delayed response to the defeat of the first Persian invasion of Greece, which had been ended by the Athenian victory at the Battle of Marathon in 490 BC. Xerxes had amassed a huge army and navy, and set out to conquer all of Greece. The Athenian politician and general Themistocles had proposed that the allied Greeks block the advance of the Persian army at the pass of Thermopylae, and simultaneously block the Persian navy at the Straits of Artemisium.
Document 11: Aristomachus of Croton: Aristomachus (or Aristomachos) was an ancient Greek leader of the popular party at Croton, in the Hannibalian war, about 215 BC.
Document 12: Sacred Band of Thebes: 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.
Document 13: Brachyllas: Brachyllas, son of Neon, was a Boeotian ally of the Macedonian king Antigonus Doson. Accordingly, when the latter took Sparta in 222 BC, he entrusted to Brachyllas the government of the city. After the death of Antigonus in 220 BC, Brachyllas continued to attach himself to the interests of Macedonia under Philip V, whom he attended in his conference with the Roman consul Flamininus at Nicaea (Locris) in 198 BC. At the battle of Cynoscephalae (197 BC) he commanded the Boeotian troops in Philip's army; but, together with the rest of his countrymen who had on that occasion fallen into Roman hands, he was sent home in safety by Flamininus, who wished thus to conciliate Boeotia. On his return he was elected Boeotarch through the influence of the Macedonian party at Thebes; in consequence of which Zeuxippus, Peisistratus, and the other leaders of the Roman party, caused him to be assassinated as he was returning home one night from an entertainment in 196 BC. Polybius records, and Livy omits to state, that Flamininus himself was privy to the crime.
Document 14: Gorgidas: Gorgidas (Ancient Greek: Γοργίδας) was the first known Theban military leader of the Sacred Band of Thebes around 378 BC.
Document 15: Phoenicia under Hellenistic rule: The Persian Empire, including modern Lebanon, eventually fell to Alexander the Great, king of Macedonia. He attacked Asia Minor, defeated the Persian troops in 333 BC, and advanced toward the Lebanese coast. Initially the Phoenician cities made no attempt to resist, and they recognized his suzerainty. However, when Alexander tried to offer a sacrifice to Melqart, Tyre's god, the city resisted. Alexander besieged Tyre in retaliation in early 332 BC. After seven months of resistance, the city fell, and its people were sold into slavery (See Siege of Tyre (332 BC)). Despite his early death in 323 BC, Alexander's conquest of the eastern Mediterranean Basin left a Greek imprint on the area. The Phoenicians, being a cosmopolitan people amenable to outside influences, adopted aspects of Greek civilization with ease.
ground_truth: the Battle of Chaeronea