Charles H. Spurgeon on Psalms 137:8

O daughter of Babylon, who art to be destroyed. In the beginning of the fifth year of Darius happened the revolt of the Babylonians which cost him the trouble of a tedious siege again to reduce them...he besieged the city with all his forces...As soon as the Babylonians saw themselves be girt by such an army as they could not cope with in the field, they turned their thoughts wholly to the supporting of themselves in the siege; in order whereto they took a resolution, the most desperate and barbarous that ever any nation practised. For to make their provisions last the longer, they agreed to cut off all unnecessary mouths among them, and therefore drawing together all the women and children, they strangled them all, whether wives, sisters, daughters, or young children useless for the wars, excepting only that every man was allowed to save one of his wives, which he best loved, and a maid servant to do the work of the house. —Humphrey Prideaux.