Cannon Such as Big Bertha Used in WWI
Puzzle 18 of Celtic Mythology Hard Pack
Question is: Cannon Such as Big Bertha Used in WWI
and the answer is: HOWITZER
Word Meaning:
HOWITZER — A cannon that combines certain characteristics of field guns and mortars, delivering projectiles with medium velocities, usually with relatively high trajectories; normally a cannon with a tube length of 20 to 30 calibers.
Definitions from Wiktionary.