August 26

Yazid I's army kills 11,000 people of Medina including notable Sahabas in Battle of al-Harrah.

In 683, Yazid I's forces captured Medina in the Battle of al-Harrah, resulting in a massacre of around 11,000 people, including revered Sahabas.

The Seljuq Turks defeat the Byzantine army at the Battle of Manzikert, and soon gain control of most of Anatolia.

In 1071, the Seljuq Turks decisively defeated the Byzantine army at the Battle of Manzikert, opening Anatolia to Turkic settlement.

Ladislaus IV of Hungary and Rudolf I of Germany defeat Ottokar II of Bohemia in the Battle on the Marchfeld near Dürnkrut in (then) Moravia.

In 1278, Ladislaus IV of Hungary and Rudolf I of Germany defeated Ottokar II of Bohemia at the Battle on the Marchfeld, altering Central European politics.

Chittorgarh falls to the Delhi Sultanate.

In 1303, Sultan Alauddin Khalji of the Delhi Sultanate captured the fortress of Chittorgarh in Rajasthan, ending its status as a Rajput stronghold.

At the Battle of Crécy, an English army easily defeats a French one twice its size.

In 1346, an English force led by Edward III overwhelmed a larger French army at the Battle of Crécy, showcasing the power of the longbow.

Battle of St. Jakob an der Birs: A vastly outnumbered force of Swiss Confederates is defeated by the Dauphin Louis (future Louis XI of France) and his army of 'Armagnacs' near Basel.

On August 26, 1444, a small Swiss force fought bravely but was defeated by the Dauphin Louis's army at the Battle of St. Jakob an der Birs near Basel.

Francisco de Orellana crosses South America from Guayaquil on the Pacific coast to the mouth of the Amazon River on the Atlantic coast.

In 1542, Francisco de Orellana completed the first recorded navigation of the Amazon River, journeying from the Pacific to the Atlantic coast.

Dutch–Portuguese War: Second Battle of San Salvador: The Dutch force the Spanish garrison at San Salvador (modern day Keelung, Taiwan) to surrender, ending the short-lived Spanish colony on Formosa and replacing it with a new Dutch administration.

On August 26, 1642, Dutch forces compelled the Spanish garrison at San Salvador (modern Keelung, Taiwan) to surrender, ending Spain's colonial presence on Formosa.

The Fronde: First Fronde: In the wake of the successful Battle of Lens, Cardinal Mazarin, Chief Minister of France, suddenly orders the arrest of the leaders of the Parlement of Paris, provoking the rest of Paris to break into insurrection and barricade the streets the next day.

On August 26, 1648, Cardinal Mazarin ordered the arrest of Paris Parlement leaders, igniting the First Fronde uprising with barricades and civil unrest.