Mehmed III, 12 days after the death of Grand Vizier Damat Ibrahim Pasha. Hasan will only serve 15 months before he being executed on the Sultan's orders on October 4, 1603. August 2 — The Oñate expedition reaches the Rita Blanco River on the day of the Feast of the Porciuncula and follows it northward into Oklahoma. August 3 — The Battle of Guruslău takes place in Goroszlo in (now Guruslău in Romania), was Wallachian troops led by Michael the Brave and Giorgio Basta defeat Transylvanian defenders commanded by Sigismund Báthory. Wallachia, assisted by Austrian troops from the Holy Roman Empire, retakes the Principality of Transylvania from Ottoman rule. September 2 — A Spanish Navy fleet of 33 ships and 4,432 men, under the command of Admiral Juan del Águila, departs Portugal after being dispatched to Ireland by King Philip III. The Spanish fleet is intended to support an Irish rebellion led by Hugh O'Neill, Earl of Tyrone and Hugh Roe O'Donnell against the British. September 6 — Pope Clement VIII issues a decree forbidding the publication of any litany, except that of the saints as found in the liturgical books and the Litany of Loreto. September 9 — The siege of Nagykanizsa, an Ottoman fortress in Hungary, is started by Archduke Ferdinand of Austria and lasts for more than two months before being abandoned. September 11 — Queen Elizabeth I summons her 10th, and last, meeting of the English Parliament. September 19 — The Juan de Oñate expedition of Spanish explorers first encounters the indigenous Escanjaque Indians in what is now the U.S. state of Kansas. The Escanjaques ask the Spaniards to assist them in a war against a rival tribe, the Rayados. Instead, Oñate befriends the Rayados five days later. September 20 — The siege of Székesfehérvár, an Ottoman occupied Hungarian fortress, is completed by troops of the Holy Roman Empire after 16 days. The Ottomans will recapture Székesfehérvár a year later. September 28 — The Escanjaque Indians attack Juan de Oñate's Spanish expedition as the Spaniards are returning from their furthest venture east, the Little Arkansas River. October–December October 2 (September 22 O.S.)— A large Spanish fleet, with 6,000 soldiers led by Juan del Águila, lands at Kinsale at County Cork in Ireland, to assist Tyrone's Rebellion. October 4 — Claudine de Culam, a 16-year-old girl in the French village of Rognon, is hanged after being convicted