Big mouth

It bears the weight of dried onions, tears of the past
Resting on rusted trunnions, with fears it won't last 
An iron egg shell age hardened, but rotten to the core
A rusting rage relic pardoned, iced under dust of a forgotten war
More noise than shell spitting fire from broken teeth and mouth
Brimstone from hell, a fitting liar, a drunken dry drought
Scattered fallen casings laying all about
Past battle tracings rebuke the face of doubt
When young a short fuse, hole now spiked
A tongue with elevation screws, black soul disliked