Lt.-Col. Maryse Carmichael became the first female commander of the Canadian Forces Snowbirds.

A U-boat sank HMCS Valleyfield in the Atlantic Ocean; 125 perished.

The Princess Patricia's Canadian Light Infantry helped prevent a German break-through in the Ypres Salient.

Maj.-Gen. Henry Procter and Tecumseh were forced to end a 10-day siege at Fort Meigs in Ohio.

1941 The British captured an Enigma cipher machine and codebooks after it boarded U-110 south of Iceland.

1945 The Allies were denied access to the port facilities at Antwerp, Belgium, and thus the ability to move equipment, supplies and men into northwestern Europe so as to push […]

The Canadian Space Agency was created.

Germans launched the invasion of the Low Countries and France.

Canadian tanks supported the attack on German lines in Italy's Liri Valley.

The Battle of the St. Lawrence began with a U-boat sinking two streamers off the Gaspé coast.

Queen Victoria asked her subjects to remain neutral in the U.S. Civil War.

Trainee navigator Kenneth Spooner took over for an unconscious pilot, saving three lives, but crashed. He is posthumously awarded the George Cross.

1940 A German bombing raid caused massive damage in Rotterdam.

Canadian air force pilot training, in hiatus since 1918, resumed at Camp Borden, near Barrie, Ontario.

U.S. President John F. Kennedy visited Ottawa.

Work began on the first Canadian military hydrofoil, HMCS Bras d'Or.

Canadians launched initial attacks at Festubert, France.

1944 May 18th: After 4 major assaults on the Monte Cassino abbey, the Germans were pushed out and forced back to the Hitler Line, by the Poles and 1st Canadian […]

John Franklin departed England in search of the Northwest Passage.

Quebec voted against negotiating sovereignty-assocation with Canada.

Lucien Bouchard resigned (May 21 - 22) from Cabinet over Meech Lake Accord constitutional amendments; subsequently formed the Bloc Québécois.

Germany and Italy signed the Pact of Steel which created a military alliance.

S.S. Komagata Maru arrived in Vancouver, but 352 Sikh, Muslim and Hindu refugees from India were turned away.

FLQ separatists bombed the U.S. consulate in Quebec City.

The first seven corvettes for the Newfoundland Escort Force arrived in St. John's.

In Korea, six Canadian soldiers were killed and 54 wounded in an attack (May 29 - 30) on Kakhul-bong (Hill 467).