שמואל ב יז:יג פירוש: רש״י

In groups. [Yonoson translates:] "Groups" as [we find], "A group of prophets."⁴Shmuel I 10:5. [and] "Groups of evildoers."⁵Tehilim 119:61.

Into the valley [below]. We will drag the city wall into the valley.