The Day of Combat Against British Colonialism is observed in Iran on September 3 each year, commemorating the sacrifice of Rais Ali Delvari, an independence activist and national hero. This memorial day was established to honor Delvari following his death during clashes with British forces on September 3, 1915, as part of the anti-colonial struggle in Persia, which was perceived as a protectorate of Russia and Britain. The day serves to remember the resistance against British colonialism, particularly highlighted by Delvari's failed attack on the British residency in Bushehr on July 12, 1915. The Ministry of Culture and Islamic Guidance of Iran officially designated this date to recognize the efforts of those who fought against foreign domination. Activities on this day typically include memorials and reflections on the historical context of colonialism in Iran.