Inferno at Bowang Slope

In Romance of the Three Kingdoms novel, when Liu Bei manages to get the youthful Zhuge Liang to serve him and treats him well. Guan Yu and Zhang Fei understimate Zhuge Liang because he is too young to be smart. Later, local warlord Cao Cao sent Xiahou Dun with 10,000 men to attack Liu Bei at Xinye. Liu Bei asks Zhuge Liang what to do and Zhuge Liang gives him the strategy to ambush Xiahou Dun at Bowang Slope (博望坡) which is near Xinye.