7 events the sources record for this year, grouped by region.
What happened
China (5)
He personally inspected the Yellow River breach at Huzi; everyone from the generals down carried firewood to block it, and he composed the 'Song of Huzi'. (Book of Han (Hanshu), Imperial Annals 漢書卷006 武帝元封二年四月)
The king of Joseon (Wiman Joseon) attacked and killed the Liaodong commandant; criminals were recruited for the campaign against Joseon. (Book of Han (Hanshu), Imperial Annals 漢書卷006 武帝元封二年)
At Huzi, where the Yellow River dike had burst, he personally oversaw the sealing of the breach, stayed two days, sank jade as a sacrifice, and had two ministers seal it. (Records of the Grand Historian (Shiji), Annals 史記卷012 孝武本紀)
Han envoy Seop Ha admonished Ugeo, but Ugeo did not comply; on his return, at the Paesu where the Joseon Bi-king Jang had come to see him off, Seop Ha stabbed him to death. (Samguk Yusa (Memorabilia of the Three Kingdoms) 紀異第一 魏滿朝鮮)
Emperor Wu recruited condemned criminals as soldiers. Yang Pu, the admiral-general, crossed the Bohai from Qi, and the left general Xun Zhi was sent out to Liaodong, to attack Chosŏn. (Zizhi Tongjian (Comprehensive Mirror) 資治通鑑 卷021 (원문 단락 #1612, -109년))
Korean Peninsula (1)
General Yang Bok, commander of the warship, with seven thousand Qi troops reached Wanghyeom first but was defeated by Ugeo; General Sun Chae could not break the western army at the Paesu. (Samguk Yusa (Memorabilia of the Three Kingdoms) 紀異第一 魏滿朝鮮)
Egypt & North Africa (1)
Metellus becomes commander in the Jugurthine War and takes Marius to Africa as his lieutenant (Plutarch's Parallel Lives Plut. Marius 7.1)