But when the children of Israel cried to Yahweh, Yahweh raised them up a savior, Ehud the son of Gera, the Benjamite, a man left-handed. The children of Israel sent tribute by him to Eglon the king of Moab.
"He sent away the people that bare the tribute"  (Judges 3:18).  This reveals that the rich tribute conveyed to Eglon was very substantial.  As much of it must have been accumulated in silver and gold, and as it no doubt also included heavy stores of grain, fruits, cattle, and other materials, a group of men were required to carry it.  Very likely, the king's bodyguard would have been very cautious and watchful as long as such a company of Israelites was present.  By sending the "carriers" away, Ehud completely disarmed all suspicion of himself.