 Around midnight , the men of the 72nd and the 52nd passed Bab al @-@ Wad noiselessly and then separated towards their respective targets . One company took Deir Ayyub , which was empty , but then were discovered as they did so by enemies on a nearby hill . They suffered the joint fire of the Legion 's artillery and machines guns . Thirteen men were killed and several other injured . The company , composed mainly of immigrants , then retreated to Bab al @-@ Wad . The 52nd Battalion was preparing to take the hill in front of Yalu , but received an order to retreat . 
