NET

14 In this initial skirmish Jonathan and his armor-bearer struck down about twenty men in an area that measured half an acre.

Darby

14 And that first slaughter which Jonathan and his armour-bearer wrought was about twenty men, as it were on the half-furrow of an acre^D1828 of land.

Darby Bible Notes

acre - Strictly, 'yoke,' i.e. as much as a yoke of oxen can plough in a day.

KJV

14 And that first slaughter, which Jonathan and his armourbearer made, was about twenty men, within as it were an half acre of land^K1367, [which] a yoke [of oxen might plow].

KJV Bible Notes

an half acre of land: Or, half a furrow of an acre of land.