Charles Spurgeon in his Treasury of David, expounding upon the carnage of Endor (Psalm 83) includes this explanatory note:
Verse 10. "... Who became as dung for the earth." In the year 1830, it is estimated that more than a million bushels of "human and inhuman bones" were imported from the continent of Europe into the port of Hull. The neighbourhood of Leipsic, Austerlitz, Waterloo, etc., where the principal battles were fought some fifteen or twenty years before, were swept alike of the bones of the hero, and the horse which he rode. Thus collected from every quarter, they were shipped to Hull, and thence forwarded to the Yorkshire bone grinders, who, by steam engines and powerful machinery, reduced them to a granulary state. In this condition they were sent chiefly to Doncaster, one of the largest agricultural markets of the country, and were there sold to the farmers to manure their lands. The oily substance gradually evolving as the bone calcines, makes better manure than almost any other substance—particularly human bones. K. Arvine.
"But the Day is coming when "... all the armor of the armed man in the tumult, and the garments rolled in blood, shall be for burning, for fuel of fire. For unto us a child is born, unto us a son is given; and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, Mighty God, Everlasting Father, Prince of Peace. Of the increase of his government and of peace there shall be no end, upon the throne of David, and upon his kingdom, to establish it, and to uphold it with justice and with righteousness from henceforth even for ever...." (Isaiah 9:5-7).