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Webster 1913 Edition

Noun.

(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.

See also: field work

fieldwork ‎(countable and uncountable, plural fieldworks)

(uncountable) work done, or observations made out in the real world rather than in controlled conditions

I thought the fieldwork in the course I was taking was going to be hard, but it was just interviewing people.

That well Bob set up last weekend was some good fieldwork.
(countable) A temporary fortification built by troops
Billy's out building some fieldwork so that our enemies don't walk right over us.