Numbers 2:9, 16, 24

So the total of all the troops on Judah’s side of the camp is 186,400. These three tribes are to lead the way whenever the Israelites travel to a new campsite.

So the total of all the troops on Reuben’s side of the camp is 151,450. These three tribes will be second in line whenever the Israelites travel.

So the total of all the troops on Ephraim’s side of the camp is 108,100. These three tribes will be third in line whenever the Israelites travel.