Question: Also known as the Battle of Greece, what Balkan conflict was Markos Drakos most notable for participating in?

Context paragraphs:
Balkan Athletics Indoor Championships: The Balkan Athletics Indoor Championships, also known as the "Balkan Indoor Games" (Greek: Βαλκανικοί Αγώνες Κλειστού Στίβου ), is an annual international indoor track and field competition between athletes from the Balkan Peninsula.  Following a test event in 1991, it was officially launched in 1994.  Organised by the Association of the Balkan Athletics Federations (ABAF), it is typically held in February.  The competition complemented the long-running annual outdoor track and field tournament: the Balkan Games.

London Conference of 1912–13: The London Conference of 1912–1913, also known as the London Peace Conference or the Conference of the Ambassadors, was an international summit of the six Great Powers of that time (Great Britain, France, Germany, Austria-Hungary, Russia and Italy) convened in December 1912 due to the successes of the Balkan League armies against the Ottoman Empire in the First Balkan War.  In particular, the conference intended to arbitrate between the warring powers as to territorial acquisitions, and also to determine the future of Albania, whose independence was proclaimed during the conflict.

Greco-Italian War: The Greco-Italian War (Italo-Greek War, Italian Campaign in Greece; in Greece: War of '40 and Epic of '40) took place between the Kingdoms of Italy and Greece from 28 October 1940 to 23 April 1941.  This local war began the Balkans Campaign of World War II between the Axis powers and the Allies.  It turned into the Battle of Greece when British and German ground forces intervened early in 1941.

Markos Drakos (general): Markos Drakos (Greek: Μάρκος Δράκος , 1888–1975) was a Lieutenant General of the Hellenic Army most notable for his leadership during the Greco-Italian War of 1940–41, as commander of the Eastern Macedonia Army Section and of the Epirus Army Section.

Battle of Greece: The Battle of Greece (also known as Operation "Marita", German: "Unternehmen Marita" ) is the common name for the invasion of Allied Greece by Fascist Italy, and Nazi Germany (April 1941) during World War II.  The Italian invasion in October 1940, which is usually known as the Greco-Italian War, was followed by the German invasion in April 1941.  German landings on the island of Crete (May 1941) came after Allied forces had been defeated in mainland Greece.  These battles were part of the greater Balkan Campaign of Germany.

Second Balkan War: The Second Balkan War was a conflict which broke out when Bulgaria, dissatisfied with its share of the spoils of the First Balkan War, attacked its former allies, Serbia and Greece, on 16 (O.S.)/29 June 1913.  Serbian and Greek armies repulsed the Bulgarian offensive and counter-attacked, entering Bulgaria.  With Bulgaria also having previously engaged in territorial disputes with Romania, this war provoked Romanian intervention against Bulgaria.  The Ottoman Empire also took advantage of the situation to regain some lost territories from the previous war.  When Romanian troops approached the capital Sofia, Bulgaria asked for an armistice, resulting in the Treaty of Bucharest, in which Bulgaria had to cede portions of its First Balkan War gains to Serbia, Greece and Romania.  In the Treaty of Constantinople, it lost Edirne to the Ottomans.

Balkan snow vole: The Balkan Snow Vole, Dinaromys bogdanovi, also known as Martino's Snow Vole is the only member of the genus Dinaromys.  Eight subspecies of this vole have been recognized from southern parts of Europe.  The genus name means "Dinaric mouse", referring to the Dinaric Alps.  The Balkan Snow Vole is a living fossil, the only living genus in the tribe Pliomyini and might arguably better be placed in "Pliomys", a genus established for its fossil relatives even before the Balkan Snow Vole was scientifically described.

Balkan frog: The Balkan frog (("Pelophylax kurtmuelleri") also known as the Balkan water frog and Greek marsh frog) is a species of frog occurring in Greece and, to a lesser extent, in Albania, Montenegro, and Serbia.  The species highly resembles "Pelophylax ridibundus", from which it was only distinguished in 1991 by bio-acoustic analysis.  The separation of the species is not unanimously accepted.

John S. Paraskevopoulos: John Stefanos Paraskevopoulos (June 20, 1889 – March 15, 1951) also known as John Paras, was a Greek/South African astronomer.  He was born in Piraeus, Greece and graduated from the University of Athens, where he obtained his PhD in Physics in 1910, under the supervision of Timoleon A. Argyropoulos.  He served in the Greek army during the Balkan Wars and World War I.  He work as an assistant of Prof. Demetrios Eginitis at the National Observatory of Athens, and in 1919, he went to the US with a two-year fellowship, spending part of that time working at Yerkes Observatory.  There he met and married Dorothy W. Block.  In 1921, he returned to Athens where he became head of the astronomy department of the National Observatory of Athens with a goal to built a large telescope in Greece.  However, due to the war between Greece and Turkey during that period and the political instability that followed it soon became evident that the large telescope for the observatory would not materialise.  So, in September 1923 Dr Paras accepted an offer from Dr Harlow Shapley, to become the Superintendent of the Harvard Observatory's Southern Station.  He left this post due to a lack of funding and went to Arequipa, Peru to work at Boyden Station, a branch of Harvard Observatory, with a view to finding a more suitable location for it.  The decision was made to move Boyden Station to South Africa due to better weather conditions, and Paraskevopoulos served there as director of Boyden Observatory in South Africa from 1927 to 1951.  He co-discovered a couple of comets.  The crater Paraskevopoulos on the Moon is named after him.

Tylis: Tylis (Greek: Τύλις) or Tyle was a capital of a short-lived Balkan state mentioned by Polybius that was founded by Celts led by Comontorius in the 3rd century BC.  Following their invasion of Thrace and Greece in 279 BC, the Gauls were defeated by the Macedonian king Antigonus II Gonatas in the Battle of Lysimachia in 277 BC, after which they turned inland to Thrace and founded their kingdom at Tylis.  It was located near the eastern edge of the Haemus (Balkan) Mountains in what is now eastern Bulgaria.  Some bands of Celts, namely the Tectosages, Tolistobogii and Trocmi, did not settle in Thrace, but crossed into Asia Minor to become known as the Galatians.  The last king of Tylis was Cavarus who maintained good relations with the city of Byzantium.  His capital was destroyed by the Thracians in 212 BC and this was also the end of his kingdom.  The modern Bulgarian village of Tulovo in Stara Zagora Province now occupies the site.

Supporting paragraphs: Markos Drakos (general) Greco-Italian War
Answer: Greco-Italian War