The Annals and the Histories · Ann. 13.57

The same summer a great battle was fought between the Hermunduri and the Chatti, both forcibly claiming a river which produced salt in plenty, and bounded their territories. They had not only a passion for settling every question by arms, but also a deep-rooted superstition that such localities are specially near to heaven, and that mortal prayers are nowhere more attentively heard by the gods. It is, they think, through the bounty of divine power, that in that river and in those forests salt is produced, not, as in other countries, by the drying up of an overflow of the sea, but by the combination of two opposite elements, fire and water, when the latter had been poured over a burning pile of wood. The war was a success for the Hermunduri, and the more disastrous to the Chatti because they had devoted, in the event of victory, the enemy's army to Mars and Mercury, a vow which consigns…

Cornelius Tacitus · trans. Church & Brodribb, 1876
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