▁given ▁to ▁I y ad ▁ibn ▁G han m ▁to ▁cr ush ▁the ▁reb els , ▁but ▁he ▁failed ▁in ▁doing ▁so , ▁and ▁send ▁for ▁help ▁to ▁K hal id ▁ibn ▁Wal id ▁who ▁was ▁in ▁Ira q ▁in ▁those ▁days . ▁ ▁Background ▁ ▁Daw mat ▁al - J andal ▁aws ▁one ▁of ▁the ▁large ▁commercial ▁towns ▁of ▁Arab ia , ▁widely ▁known ▁for ▁its ▁rich ▁and ▁much - fre qu ented ▁market . ▁It ▁was ▁also ▁an ▁important ▁communication ▁centre , ▁a ▁meeting ▁point ▁of ▁routes ▁from ▁Central ▁Arab ia , ▁Ira q ▁and ▁Sy ria . ▁At ▁about ▁the ▁time ▁when ▁K hal id ▁ibn ▁Wal id ▁set ▁off ▁from ▁Yam am ah ▁for ▁the ▁invasion ▁of ▁Ira q , ▁Ab u ▁Bak r ▁had ▁sent ▁I y ad ▁ibn ▁G han m ▁to ▁capture ▁Da um at - ul - J andal ▁and ▁once ▁again ▁bring ▁the ▁northern ▁tribes ▁into ▁submission . ▁I y ad ▁arrived ▁at ▁Da um at - ul - J andal ▁to ▁find ▁it ▁strongly ▁def ended ▁by ▁Ban u ▁Kal b , ▁a ▁large ▁Christian ▁Arab ▁tribe ▁inhab iting ▁this ▁region ▁and ▁the ▁eastern ▁fr inge ▁of ▁Sy ria . ▁ ▁He ▁deployed ▁his ▁force ▁against ▁the ▁southern ▁face ▁of ▁the ▁fort ▁known ▁as ▁Mar id , ▁and ▁the ▁situation ▁that ▁now ▁developed ▁was , ▁from ▁the ▁military ▁point ▁of ▁view , ▁abs urd . ▁The ▁Christian ▁Arab s ▁considered ▁themselves ▁to ▁be ▁under ▁sie ge , ▁but ▁the ▁routes ▁from ▁the ▁northern