Bulfinch's Mythology The Age of Fable
Page: 226That the Druids offered sacrifices to their deity there can be no doubt. But there is some uncertainty as to what they offered, and of the ceremonies connected with their religious services we know almost nothing. The classical (Roman) writers affirm that they offered on great occasions human sacrifices; as for success in war or for relief from dangerous diseases. Caesar has given a detailed account of the manner in which this was done. "They have images of immense size, the limbs of which are framed with twisted twigs and filled with living persons. These being set on fire, those within are encompassed by the flames." Many attempts have been made by Celtic writers to shake the testimony of the Roman historians to this fact, but without success.