A mobile artillery piece, i.e. gun or howitzer, for use in the field.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "fieldpiece" in a sentence
"Glad "Charlie" didnt have that (like in a fieldpiece) dug in on some God for saken hill."
"English officer, apparently of high rank, standing, alone and unsupported, by a fieldpiece, which, after the flight of the men by whom it was wrought, he had himself levelled and discharged against the clan of"
"After the last hot fieldpiece was hauled out and the casualties of the campaign reckoned, the roll showed that Pegram had lost 7 killed and 53 wounded, a total of 60, in a battery of 80 men."