Díjūn bùguò shì yī qún wūhézhīzhòng, hěnkuài jiù kuìbài le.
The enemy troops were nothing but a disorderly rabble and quickly collapsed.
Tips
history
This idiom originates from the 后汉书 (Book of the Later Han), where it described an undisciplined army as resembling crows randomly flocking together. Crows (乌) are known for gathering chaotically, making them a symbol of disorder.
memory
Picture a flock of crows (乌) suddenly flocking (合) together - no order, just chaos. That is the crowd (众) described by this idiom.