21 cm Mrs 18
21 cm Mrs 18 is a field howitzer or 210 mm artillery.
Also recorded as 210 mm howitzer M 18; Howitzer, Towed, 210 mm, M 18; M 18/L31; 21cm Mrs 18.
Overview
1939 German 210 mm field howitzer.
In detail
It is associated with Germany.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“21 cm Mörser 18”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q212918: 21 cm Mrs 18
Consult the source