▁through ▁the ▁coast al ▁plain ▁of ▁Palest ine . ▁Their ▁main ▁enc amp ments ▁were ▁between ▁De ir ▁al - Bal ah ▁and ▁Gaz a , ▁while ▁they ▁often ▁migr ated ▁to ▁the ▁vic inity ▁of ▁Heb ron ▁in ▁the ▁summer . ▁Begin ning ▁with ▁Sultan ▁Bay bars , ▁the ▁Mam lu ks ▁entr usted ▁the ▁J arm , ▁along ▁with ▁other ▁T ay y id ▁cl ans ▁with ▁protect ing ▁the ▁coun tr ys ide , ▁providing ▁Arab ian ▁horses ▁for ▁the ▁bar id ▁( post al ▁route ), ▁and ▁lev ied ▁tax es ▁on ▁them . ▁The ▁ch ie ft ains ▁of ▁J arm ▁and ▁other ▁T ay y id ▁cl ans ▁were ▁known ▁as ▁" em irs " ▁( pr in ces ). ▁In ▁the ▁M aml uk ▁hierarchy , ▁the ▁military ▁rank ▁of ▁the ▁pre em inent ▁em ir ▁of ▁the ▁J arm ▁was ▁equal ▁to ▁that ▁of ▁a ▁Dam asc us - based ▁am ir ▁ash ara ▁( em ir ▁of ▁ten ▁caval ry ) ▁or ▁an ▁Ale ppo - based ▁am ir ▁as hr in ▁( em ir ▁of ▁twenty ▁caval ry ). ▁In ▁the ▁M aml uk ▁records , ▁the ▁strength ▁of ▁the ▁J arm ▁was ▁ 1 , 0 0 0 ▁caval ry , ▁making ▁them ▁one ▁of ▁the ▁smaller ▁leading ▁tribes ▁of ▁Bil ad ▁al - Sh am ▁( the ▁Lev ant ); ▁the ▁largest ▁was ▁Al ▁F ad l , ▁the ▁most ▁powerful ▁T ay y id ▁cl an . ▁ ▁In ▁