Giant German Wooden Trench Mortars! Be Afraid…be very afraid.

This Australian War Memorial image of an Albrecht likely depicts the largest variety (45cm bore) of this odd weapon. (AWM E 02902)

This Australian War Memorial image of an Albrecht likely depicts the larger (35 or 45 cm bore) type of this odd weapon. (AWM E 02902)
Though they would seem to be the product of a deranged cooper, not a highly industrialized nation that produced Krupp super guns and mortars on mass scale, these were terrifying weapons in the trenches. They lobbed a massive explosive tin dubbed a “coal scuttle” by allied troops. It was a very simple cylindrical tin packed with explosives and iron bits. The weapon normally had a maximum range of about 600m. These came in 25cm, 35cm, and 45cm barrel sizes.  The bottom photo shows an erdmorser (buried trench mortar), which was usually buried in the ground with the rails propped against an embankment or trench wall to roughly aim it at an enemy trench.  The other photos are Albrecht mortars, whose barrels are constructed of wooden staves and reinforced by wire wound round them. 
Albrecht 25cm mortar
Albrecht 25cm mortar, Canadian War Museum (Author’s photo)
albrecht barrel with metal sleeve
albrecht barrel with metal sleeve, which should be along the lower interior of the mortar (courtesy Brome County Historical Society)
Erdmorserspeciallowres
This strange mortar was not an Albrecht, but an erdmorser (another type of wooden mortar whose breech end was buried in the ground, the long trough was then propped up to fire on the target). This appears to have been placed on a standard Albrecht mounting, but whether this was done in the field or for convenience by archives staff here at the War Trophies Annex is unknown. (LAC photo)

Trench mortars offered artillery support to troops near the front lines, and they were sited close to the firing line, making rapid communication and fire tasking possible (unlike fixed artillery located in the rear).  At the outbreak of war, the Germans could draw on many more well-designed mortars than Allied powers, which scrambled to adapt and improvise close-support weapons. Still, the Germans felt the need to produce these unusual wooden mortars.  In Canada today at least two of these rare and strange mortars exist: The Canadian War Museum had a nice example, and the Brome County Historical Society has an un-mounted barrel in the corner of its displays.  Both these are the 25cm varieties.