וְאַחֲרָ֛יו שַׁמָּ֥א בֶן־אָגֵ֖א הָרָרִ֑י וַיֵּאָסְפ֨וּ פְלִשְׁתִּ֜ים לַחַיָּ֗ה וַתְּהִי־שָׁ֞ם חֶלְקַ֤ת הַשָּׂדֶה֙ מְלֵאָ֣ה עֲדָשִׁ֔ים וְהָעָ֥ם נָ֖ס מִפְּנֵ֥י פְלִשְׁתִּֽים׃
And after him was Shammah the son of Age the Ararite. And the Philistines were gathered together into a troop, where was a plot of ground full of lentils; and the people fled from the Philistines.
Rashi on II Samuel
For [war like] beast in the wild. [Gathering] to become troops like the beasts gather in the wild.