On June 14, 1777, the Second Continental Congress passed the Flag Resolution which stated: "Resolved, That the flag of the thirteen United States be thirteen stripes, alternate red and white; that the union be thirteen stars, white in a blue field, representing a new constellation." Flag Day is now observed on June 14 of each year.

After spending several days looking for each other, the two armies collided at the Battle of Marengo on 14 June. General Melas had a numerical advantage, fielding about 30,000 Austrian soldiers while Napoleon commanded 24,000 French troops. The Battle of Marengo was fought on 14 June 1800 between French forces under the First Consul Napoleon Bonaparte and Austrian forces near the city of Alessandria, in Piedmont, Italy. Late in the afternoon, a full division under Louis Desaix arrived on the field and reversed the tide of the battle. A series of artillery barrages and cavalry charges decimated the Austrian army, which fled over the Bormida River back to Alessandria, leaving behind 14,000 casualties.

On 14 June Napoleon obtained an overwhelming victory over the Russians at the Battle of Friedland, wiping out the majority of the Russian army in a very bloody struggle. The scale of their defeat convinced the Russians to make peace with the French.

Hermann von Natzmer was the former Prussian officer who had been in charge of the arsenal of Berlin. Refusing to shoot insurgent forces who stormed the arsenal on June 14, 1848, Natzmer became a hero to insurgents across Germany.

On June 14, 1914, Armstrong was released into the custody of his father and his new stepmother, Gertrude. He lived in this household with two stepbrothers for several months. After Gertrude gave birth to a daughter, Armstrong's father never welcomed him, so he returned to his mother, Mary Albert. In her small home, he had to share a bed with his mother and sister.