During the raid on Es Salt in May 1918, Grant's 4th Light Horse Brigade was given the task of guarding the flank. When the plan failed, it was on his brigade that the main Turkish blow fell. The light horsemen fought hard but the Turks subjected them to fierce artillery and machine gun fire, and were able to drive them from their positions. Grant managed to avoid being overrun, and was able to withdraw by night without issue. Nine of the twelve British guns supporting the brigade were lost. Grant was blamed for the loss of the guns and for faulty defensive positions.