August 14–Battle of Hab: The Crusaders under King Baldwin II of Jerusalem (supported by forces of Count Pons of Tripoli) defeat Ilghazi's army at Ariha in Syria. Baldwin manages to re-capture all of the Crusader castles and returns to Antioch in triumph. He stabilizes the frontiers and prevents Ilghazi from marching on Antioch.[2]
August 20–Battle of Brémule: King Henry I of England defeats King Louis VI (the Fat) of France and his 400 knights in Normandy. A skirmish that begins with the French launching a fierce but disordered attack, and ends with the French turning tail. Louis agrees to make peace and formally recognizes William Adelin as duke of Normandy.
Zhu Yu, a Chinese historian, writes his book Pingzhou Table Talks (published this year), the earliest known use of separate hull compartments in ships. Zhu Yu's book is the first to report the use of a magnetic compass for navigation at sea. Although the first actual description of the magnetic compass is by another Chinese writer Shen Kuo in his Dream Pool Essays (published in 1088).
McGrank, Lawrence (1981). "Norman crusaders and the Catalan reconquest: Robert Burdet and te principality of Tarragona 1129-55". Journal of Medieval History. 7 (1): 67–82. doi:10.1016/0304-4181(81)90036-1.