Hypertext Webster Gateway: "fieldwork"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Fieldwork \Field"work`\, n. (Mil.)
Any temporary fortification thrown up by an army in the
field; -- commonly in the plural.
All works which do not come under the head of permanent
fortification are called fieldworks. --Wilhelm.
From WordNet (r) 1.7 (wn)
fieldwork
n : a temporary fortification built by troops in the field
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