
1) Cannons on wheels 2) Chinese invention 3) Military magazine
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https://www.crosswordclues.com/clue/field-artillery
[magazine] Field Artillery (or FA) is a discontinued bimonthly magazine on the subject of field artillery, published from 1911 to 2007. It was published by the US Field Artillery Association, Fort Sill, Oklahoma and was an official publication of the United States Army Field Artillery Corps. Its intended readership included active and reser...
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http://en.wikipedia.org/wiki/Field_Artillery_(magazine)

Field artillery is a category of mobile artillery used to support armies in the field. These weapons are specialized for mobility, tactical proficiency, long range, short range and extremely long range target engagement. Until the early 20th century, field artillery were also known as foot artillery, for while the guns were pulled by beasts of bur...
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http://en.wikipedia.org/wiki/Field_artillery

any large-calibre, crew-operated, mounted firearm designed for easy movement in the field. See artillery.[2 related articles]
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http://www.britannica.com/eb/a-z/f/22

The term field-artillery refers to relatively light ordnance easy of draught, and hence fitted for rapid movements in the field.
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http://www.probertencyclopaedia.com/browse/FYF.HTM

[
n] - artillery (other than antiaircraft) used by armies in the field (especially for direct support of front-line troops)
Found on
http://www.webdictionary.co.uk/definition.php?query=field%20artillery
field gun noun movable artillery (other than antiaircraft) used by armies in the field (especially for direct support of front-line troops)
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https://www.encyclo.co.uk/local/20974

artillery mobile enough to accompany troops in the field.
Found on
https://www.infoplease.com/dictionary/field-artillery
No exact match found.