Question: Messapus join with whom in a battle against Aeneas and the Trojans which was described in the Greek Epic Cycle, in particular in the "Iliad"?

With his brother Archelochus and his cousin Aeneas, Acamas was lieutenant of the Dardanian contingent to assist King Priam.  Along with Aeneas and Archelochus he led one of the five divisions attacking the Argive wall in the battle for the ships.  Homer's "Iliad", Book 2.  823 describes the troops of the Dardanians and its leaders: ""The Dardanians were led by brave Aeneas, whom Aphrodite bore to Anchises, when she, goddess though she was, had lain with him upon the mountain slopes of Ida.  He was not alone, for with him were the two sons of Antenor, Archilokhos and Akamas, both skilled in all the arts of war." "While in Book 16, Acamas avenged the death of his brother, who had been killed by Ajax, by slaying Promachus the Boeotian."But he knew well who it was, and the Trojans were greatly vexed with grief [akhos].  Akamas then bestrode his brother's body and wounded Promakhos the Boeotian with his spear, for he was trying to drag his brother's body away.  Akamas vaunted loudly over him saying, "Argive archers, braggarts that you are, toil [ponos] and suffering shall not be for us only, but some of you too shall fall here as well as ourselves.  See how Promakhos now sleeps, vanquished by my spear; payment for my brother's blood has not long delayed; a man, therefore, may well be thankful if he leaves a kinsman in his house behind him to avenge his fall."" <SEP> Troy (Ancient Greek: Τροία , "Troia" and Ἴλιον , "Ilion", or Ἴλιος , "Ilios"; Latin: "Trōia" and "Īlium" ; Hittite: "Wilusha" or "Truwisha"; Turkish: "Truva or Troya" ) was a city situated in the far northwest of the region known in late Classical antiquity as Asia Minor, now known as Anatolia in modern Turkey, near (just south of) the southwest mouth of the Dardanelles strait and northwest of Mount Ida.  The present-day location is known as Hisarlik.  It was the setting of the Trojan War described in the Greek Epic Cycle, in particular in the "Iliad", one of the two epic poems attributed to Homer.  Metrical evidence from the "Iliad" and the "Odyssey" suggests that the name Ἴλιον ("Ilion") formerly began with a digamma: Ϝίλιον ("Wilion"); this is also supported by the Hittite name for what is thought to be the same city, Wilusa. <SEP> Messapus, a character in Virgil's "Aeneid", appears in Books VII and IX of the Latin epic poem.  He was a famous tamer of horses and king of Etruria, known for being one "whom no one can fell by fire or steel" (Mandelbaum, VII.911-912); perhaps because he is a son of Neptune.  In Book IX, which recounts the nighttime raid by Nisus and Euryalus on the Rutulian camp, the battle helmet of Messapus is taken by Euryalus.  Light reflected off the stolen helmet, betraying Euryalus to his enemies and leading not only to his own death, but also that of Nisus.  Although accustomed to peace, in Book VII Messapus joins forces with Turnus in his battle against Aeneas and the Trojans. <SEP> The Cypria (Greek: Κύπρια "Kúpria"; Latin: "Cypria") is an epic poem of ancient Greek literature, which has been attributed to Stasinus and was quite well known in classical antiquity and fixed in a received text, but which subsequently was lost to view.  It was part of the Epic Cycle, which told the entire history of the Trojan War in epic hexameter verse.  The story of the "Cypria" comes chronologically at the beginning of the Epic Cycle, and is followed by that of the "Iliad"; the composition of the two was apparently in the reverse order.  The poem comprised eleven books of verse in epic dactylic hexameters.