Cut off all retreat
"Burn one's bridges" comes from Historical Records of Xiang Yu. In the Battle of Julu, in order to boost morale, Xiang Yu ordered to cross the rubicon, saying that there was no hope of retreat and he had to go all out.
A hole was drilled in the wall to get light from the neighbor's house.
"Digging the wall to steal the light" comes from "Han Zhuan". Kuang Heng was born into a poor family when he was young. In order to study, he dug up the fence and studied day and night by the lights of his neighbor's house.
(of people living in a foreign country) so happy that they forget their home and responsibilities.
"Don't think about happiness" comes from Romance of the Three Kingdoms. After Liu Bei occupied Shu, he was addicted to amusement and didn't make progress, which was called "being happy without thinking about Shu".
When the map is unfolded,
"I am eager to find out" comes from Historical Records and Biography of Su Qin. In order to assassinate the king of Qin, Jing Ke was caught by the king of Qin and had to commit suicide with a dagger in front of the king of Qin.
Give one's last dedication
"Do one's best" comes from Zhuge Liang's biography in the later Han Dynasty. Zhuge Liang worked day and night for the country and people until the last moment of his life.
Cock crow and practice sword-diligence and self-discipline
"Smell the chicken and dance" comes from Biography of Zu Ti in the Book of Jin. When Zu Ti was young, he got up every morning to practice sword when he heard the cock crow, and later became an excellent general.