וַתְּהִ֞י הַמַּכָּ֣ה הָרִאשֹׁנָ֗ה אֲשֶׁ֨ר הִכָּ֧ה יוֹנָתָ֛ן וְנֹשֵׂ֥א כֵלָ֖יו כְּעֶשְׂרִ֣ים אִ֑ישׁ כְּבַחֲצִ֥י מַעֲנָ֖ה צֶ֥מֶד שָׂדֶֽה׃
Cette première défaite, où Jonathan et son serviteur tuèrent une vingtaine d’hommes, eut lieu dans l’espace d’un demi-arpent de terre environ.
Rashi on I Samuel
Half a furrow, of a pair [of oxen plowing] in the field. Within the area of a land measure [equal to] half the amount of a furrow of the plowing of a pair of oxen plowing a field.
Rashi on I Samuel
Furrow. That is the ridge which is called 'reie' in O.F. This was a very mighty deed, because they were near each other and ready to help each other.