The figurative use of the word "barrage"

Solution 1:

barrage n.

Literally, a barrage is a bombardment (concentrated discharge) of artillery fire, bullets etc.

Figuratively the word ... Columbia Guide to Standard American English

is also used to signify an overwhelming quantity or outpouring of anything. In her I962 book Silent Spring (R Carson) said of America's widespread use of chemical insecticide: "As crude a weapon as a caveman's club, the chemical barrage has been hurled against the fabric of life."

Parsing your question to the use of barrage, a barrage of pursuing guards is grammatical, at least in AmE. A quick search reveals a barrage of pain, a barrage of rain and yes even a barrage of valentine cards! Andbthere are many more barrages of X.