וַיַּ֨ךְ אוֹתָ֥ם שׁ֛וֹק עַל־יָרֵ֖ךְ מַכָּ֣ה גְדוֹלָ֑ה וַיֵּ֣רֶד וַיֵּ֔שֶׁב בִּסְעִ֖יף סֶ֥לַע עֵיטָֽם׃ (ס)
I tak poraził ich od goleni do bioder porażeniem wielkiem. Poczem zstąpił i osiadł w rozpadlinie skalnej Etamu.
Rashi
Cavalry and infantry [lit. calf and thigh]. "Horsemen and foot soldiers."6This is Targum Yonasan’s translation. “Calf” refers to the horseman, supported by the calf, as Rashi explains, and “thigh” refers to the footsoldier, whose weight is supported by the thigh. The horseman is not supported by the thigh, but by the calf of the foot inserted into the metal stirrup hanging from the saddle.
Rashi
On the promontory of a crevice of the Eitam cliff. Similarly, "The promontories of the cliffs,"7Yeshaya, 2:21 "[He] shall remove its branches."8Ibid, 10:33.