一触即溃

jì lǜ huàn sàn de jūn duì kě néng huì yī chù jí kuì

纪律涣散的军队可能会一触即溃。

An army that lacks discipline would most probably be routed at the first encounter with the enemy.

dí jūn shì qì huàn sàn yī chù jí kuì

敌军士气涣散，一触即溃。

The enemy were demoralized and collapsed at the first encounter.