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A Raschen bag is a bag of
A Raschen bag is a bag of ballast
Ballast is material that is used to provide stability to a vehicle or structure. Ballast, other than cargo, may be placed in a vehicle, often a ship or the gondola of a balloon or airship, to provide stability. A compartment within a boat, ship ...
that is placed underneath the baseplate of a mortar to improve its accuracy when used on snow or other soft ground conditions. Raschen bags are named after Colonel Dan Raschen, Royal Engineers, who invented but did not name them.
References
Mortars {{artillery-stub