Fausset's Bible Dictionary
"the field of strong men" (Vulgate), "the field of swords" (Gesenius). The smooth ground near the pool of Gibeon, where Joab's men and Abner's men fought and slew one another, and so brought on a general engagement.
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Fausset, Andrew R. Entry for 'Helkath Hazzurim'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/h/helkath-hazzurim.html. 1949.