Shock troops
From Tardis Wiki, the free Doctor Who reference
The Fourth Doctor identified Sontarans of the Sontaran Special Space Service who participated in the Sontaran invasion of Gallifrey as shock troops. (TV: The Invasion of Time)
Gallifreyan shock troops served in the Last Great Time War. (AUDIO: The Rulers of the Universe)
As observed by the Eleventh Doctor in an alternate timeline, the cyber-converted Judoon served as the Cybermen's shock troopers, mindlessly destroying everything in their path. (COMIC: Assimilation²)
