5 events the sources record for this year, grouped by region.
What happened
China (1)
In April 743 (Dinghai day), Huangfu Weiming leads troops out of Xiping and attacks Tubo; he marches more than a thousand li and attacks and breaks Hongji castle. (Zizhi Tongjian (Comprehensive Mirror) 권215 743년 항)
Japan (1)
At Shigaraki palace the sovereign opens the temple site for the first time to build a Rushana (Vairocana) Buddha image; the monk Gyōki leads his disciples to encourage the people. (Shoku Nihongi (Continued Chronicles of Japan) 續日本紀 卷第15 「乙酉。皇帝御紫香樂宮」)
Western Europe (3)
Æthelbald, king of Mercia, and Cuthred, king of Wessex, fought the Welsh together. (Anglo-Saxon Chronicle Giles/Ingram 1847 A.D. 743 항 (pg657.txt 줄 2114))
Carloman and Pippin join forces to attack Odilo, Duke of Bavaria; they fight a battle and defeat his army (Royal Frankish Annals ARF(Einhard판) a.743, Kurze 1895 p.5)
Afterward Carloman goes alone to Saxony and receives the surrender of the castle of Hohseburg and of the Saxon leader Theoderic within it (Royal Frankish Annals ARF(Einhard판) a.743, Kurze 1895 p.5)