Ohi Day (Greek: Επέτειος του Όχι, romanized: Epéteios tou Óchi, lit.
Ohi Day commemorates the rejection by the Greek dictator Ioannis Metaxas of the ultimatum made by Italian dictator Benito Mussolini on 28 October 1940 and the subsequent Hellenic counterattack against the invading Italian forces at the mountains of Pindus during the Greco-Italian War and Greek resistance during the Axis occupation.
He presented Metaxas with an ultimatum: allow Axis forces to enter Greek territory and occupy certain unspecified "strategic locations" or otherwise face war.
[1][2] In response to Metaxas's refusal, Italian troops stationed in Albania, then an Italian protectorate, attacked the Greek border at 05:30 am – the beginning of Greece's participation in World War II (see Greco-Italian War and the Battle of Greece).
The events of 1940 are commemorated every year with military and student parades and on every anniversary, most public buildings and residences are decorated with national flags.