Matthew Poole and continuators on Judges 21:4

4 And it came to pass on the morrow, that the people rose early, and built there an altar , and offered burnt-offerings, and peace▪offerings.

Not for a Monument of the Victory, as some say, but for Sacrifices, as the next words shew. Qu. What need was there of this, when the ordinary Altar was there, to which also they seem to be restrained, Deut. 16. 2? Answ. They are not there restrained to one Altar, but to one place of Worship, as is expressed; and therefore there might be in that place more Altars than one, when the Multitude of Sacrifices so required, which was the case, 1 King. 8. 64. and probably at this time, when all the Tribes being met, they had many Sacrifices to offer, some in common for all, and some peculiar to every Tribe. Nay, other Altars might be, and oft-times were Erected in other places, by Divine Direction or Dispensation; as Iudg. 6. 24, 26. 1 Sam. 7. 9, 17. and 11. 15. and 16. 2, 5.