Summer – A German expeditionary force under Frederick II, Holy Roman Emperor, invades the Romagna and Tuscany, hoping to capture Rome. He appoints his 21-year-old son, Enzo of Sardinia, as imperial vicar general for Northern Italy. Frederick also threatens with war against Venice, which has sent ships to blockade the harbors on Sicily. In order to finance his growing need for arms, he institutes an administrative reorganization of the Holy Roman Empire (among others, the formation of 10 vice regencies in Italy).
November 2 – An expeditionary force (some 4,000 knights) under Theobald I sets out from Acre for the Egyptian frontier, detachments from the military orders and several local barons accompany the Crusaders. While marching to Jaffa, a Crusader column led by Peter of Brittany and his lieutenant Raoul de Soissons with two hundred knights, lays an ambush and attacks a rich Muslim caravan.[3]
November 12 – Sultan as-Salih Ayyub sends an Ayyubid army to Gaza to protect the Egyptian border. At nightfall, Henry of Bar, jealous of the successful ambush of Peter of Brittany, decides to march out towards Gaza with a Crusader force (some 500 knights and 1,000 soldiers). Although warned by Theobald I, Henry sets up camp in a flat terrain surrounded by sand dunes near Gaza.[4]
November 13 – Battle of Gaza: The Crusader army led by Henry of Bar is defeated by the Egyptians near Gaza. More than a thousand men are slaughtered, including Henry himself. Six hundred more are captured and carried off to Egypt. Among them are Amaury VI de Montfort and Philippe de Nanteuil – who, in the dungeons of Cairo, writes a Crusade song about the failure of the expedition.[5]
December 7 – Ayyubid forces under An-Nasir Dawud march on Jerusalem, which is largely undefended. The garrison of the city surrenders to Dawud, after accepting his offer for a safe-conduct to Acre. Dawud destroys Jerusalem's fortifications, including the Tower of David. Meanwhile, Theobald I (losing many men underway) moves with the remnants of the Crusader army northward to Acre.[6]
October 18 – Sack of Chernigov: The Mongols led by Batu Khan attack Chernigov; the garrison rallies outside the walls to face the Mongols in a pitched battle. Prince Mstislav III Glebovich comes to help with his troops but they are slaughtered by Mongol catapults. The city is pillaged as are the towns in the surrounding countryside.
^Painter, Sidney (1969). The Crusade of Theobald of Champagne and Richard of Cornwall, 1239–1241, p. 472. Robert Lee Wolff; Harry W. Hazard (eds.). A History of the Crusades, Volume II: The Later Crusades, 1189–1311, pp. 463–86. Madison: University of Wisconsin Press.
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