John Gill Commentary Judges 18:16

"And the six hundred men girt with their weapons of war, who were of the children of Dan, stood by the entrance of the gate." — Judges 18:16 (ASV)

And the six hundred men appointed with their weapons of war ,
&c.] Who were armed men, and marched with their armour about them:

which were of the children of Dan ;
for no other were concerned in this expedition: stood by the entering of the gate; not of Micah's house, but of the city in which his house was; here they stood while the five men went up to the house.