Wikipedia:Selected anniversaries/May 28
May 28: Whit Monday in Christianity, Memorial Day in the United States (2007); Republic Day in Armenia and Azerbaijan.
- 1588 - Anglo-Spanish War: The Spanish Armada, with 130 ships and over 30,000 men, set sail from Lisbon for the English Channel to engage English naval forces.
- 1892 - The environmental organization Sierra Club was founded by preservationist John Muir in San Francisco.
- 1905 - Japanese forces led by Admiral Togo Heihachiro (pictured) destroyed the Russian Baltic Fleet in the Battle of Tsushima, the decisive naval battle in the Russo-Japanese War.
- 1918 - The Azerbaijan Democratic Republic, one of the first democratic republics in the Muslim world, was proclaimed in Ganja by the Azerbaijani National Council.
- 1961 - An article by Peter Benenson was published in newspapers, starting a letter-writing campaign that grew and became Amnesty International.