Hwach'a. Hur effektivt var det vapnet egentligen?

"Some of the first anti-personnel devices created in Korea were comprised of small rockets attached to arrows, which flung spikes upon detonation. When it was discovered that several of these rockets could be launched from the same container, larger versions of these anti-personnel devices were created and utilized in battle. These larger anti-personnel devices were designed to be transported on wheeled vehicles such as a two-wheeled carts and wheelbarrows. The Hwach'a, which was invented in 1451, allowed a single man to transport approximately 100 rockets into battle, and was well suited to combat the invading Japanese Samurai who typically advanced on the Koreans in dense groups, presenting ideal targets for the Hwach'a operators."

Det jag ser framför mig är en Korean med en stor fyrverkeripjäs på en skottkärra, där varje "raket" har en pilspets fastsurrad längst fram.
Min fråga är:
Hur effektivt var egentligen detta vapen? För vid första tanke låter det som en leksak!

/Spader

På beskrivningen låter det som raketen exploderar och skjuter iväg splitter. En hel svärm av sådana raketer som slår in i en skock soldater borde vara ganska effektivt.

Låter ungefär som en medeltida stalinorgel med men dock lite mindre effektiv. Eller är jag helt fel ute?

Kan nog vara effektivt om man lyckas få in "raketerna" i stora folksamlingar.