Later on the two young men became good friends and together they established and whetted their conducts and studies endlessly。Later on they found the Sui Dynasty tended to decay，so they organized an army and rose up against it without delay。
Yang Xuangan made Li Mi his military consultant，and Li Mi helped Yang Xuangan decide strategy to fight for the country。But in a key battle he didn't follow Li Mi's idea，and Xuangan got killed and his men all defeated。
Li Mi had nowhere to dwell，and had to join the Wagang village volunteers to rebel。Later he became a chief mander of a peasants uprising force，which heavily tore the foundation of the imperial rulers，and his heroism goes down from generation to generation。
You can use“Hang a Book on a Cow's Horn”as an idiom to praise a person who studies very hard。