Chen Gong
Throughout 194 and 195, Cao Cao and Lü Bu fought several battles of some size for the control of Yan Province. Though Lü Bu initially did well in holding Puyang, Cao Cao won almost every engagement outside of Puyang. Cao Cao's decisive victory came in a battle near Dongming. Lü Bu and Chen Gong led a large army to assault Cao Cao's forces. At that time, Cao Cao was out with a small army, harvesting grain. Seeing Lü Bu and Chen Gong approaching, Cao Cao hid his soldiers in some woods and behind a dam. He then sent a small force ahead to skirmish with Lü Bu's army. Once the two forces were committed, he unleashed his hidden soldiers. Lü Bu's army was devastated by this attack and many of his soldiers fled.