From the "Screaming Mimi" (Nebelwerfer, 1930s), or "Katie" (Katyusha, late 1930s).
His was used by both British & Canadian forces in the summer of 1944, with mixed results.

?
edit-ola
The "British Z-gun", anti-aircraft rocket launcher. My next guess would've been the "HedgeHog", since it's also a "spigot" system.

__________________

Morbius, Morbius! Something is approaching from the Southwest. It is now quite close.