At Anzhong, Cao Cao dug a tunnel at night, hid his cavalry, and routed the joint army of Zhang Xiu and Liu Biao. (Records of the Three Kingdoms (Sanguozhi) 魏書 武帝紀 (卷01) 建安3년)
Cao Cao breached the Si and Yi rivers to flood Xiapi, captured Lü Bu and Chen Gong, and killed them both. (Records of the Three Kingdoms (Sanguozhi) 魏書 武帝紀 (卷01) 建安3년)
Cao Cao dug a moat around Xiapi and besieged it for a long time, and as the troops tired, Xun You and Guo Jia advised that Lü Bu was brave but reckless and should be attacked quickly. They led in the Ji and Si rivers to flood the city. (Zizhi Tongjian (Comprehensive Mirror) 資治通鑑 卷062 (원문 단락 #5140, 198년))
Lü Bu, seeing Cao Cao, said 'From today on, the world is settled,' and asked Liu Bei to say a word on his behalf, since the binding was too hasty. Cao Cao also spoke with Chen Gong. (Zizhi Tongjian (Comprehensive Mirror) 資治通鑑 卷062 (원문 단락 #5142, 198년))
West Asia (7)
Severus took Seleucia and Babylon, abandoned by the Parthian army (Cassius Dio, Roman History 76(75).9.3)
Severus took Ctesiphon, plundering and massacring, with 100,000 captives; Vologaesus did not pursue and withdrew for lack of supplies (Cassius Dio, Roman History 76(75).9.4)
Severus crossed Mesopotamia and attacked Hatra, but his siege engines were burned and he lost many soldiers and withdrew (Cassius Dio, Roman History 76(75).10.1)
When Plautianus fell ill at Tyana, his soldiers blocked the emperor's attendants from entering; an anecdote of the emperor living under his domination (Cassius Dio, Roman History 76(75).15.4)
Severus besieges Hatra in Mesopotamia, but the city is strong and he withdraws with only losses. (Herodian, History of the Empire 3.9)
As summer ends he invades Parthia, defeats the king, reaches Ctesiphon, and takes the city in early winter (Historia Augusta Sev. 16.1)
Southern Europe (3)
Severus built ships on the Euphrates; some troops embarked and others marched along the riverbank (Cassius Dio, Roman History 76(75).9.3)
Herodian criticizes Severus for loosening army discipline by allowing soldiers grain rations, gold rings and living with their wives. (Herodian, History of the Empire 3.8)
After the Parthian War, at the glorious time when Severus made Bassianus co-ruler, he gives Geta the title Caesar (Historia Augusta Geta 5.3)