钳马衔枚

qián mǎ xián méi

with horses and soldiers gagged (idiom)

(of a marching army) in utter silence

qián

pincers

abbr. for Malaysia 馬來西亞|马来西亚[Ma3 lai2 xi1 ya4]

xián

bit (of a bridle)

méi

classifier for small objects: coins, badges, rings, carved seals, chess pieces, eggs, fingerprints etc (more formal than 個|个[ge4])