Jamieson, Fausset and Brown on Judges 4:11

11. Now Heber the Kenite ... pitched his tent--It is not uncommon, even in the present day, for pastoral tribes to feed their flocks on the extensive commons that lie in the heart of inhabited countries in the East (see on Jud 1:16).

plain of Zaanaim--This is a mistranslation for "the oaks of the wanderers." The site of the encampment was under a grove of oaks, or terebinths, in the upland valley of Kedesh.