There is a river called the Saône, which flows through the territories of the Aedui and the Sequani into the Rhône with an extremely sluggish current… - Gaius Julius Caesar

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There is a river called the Saône, which flows through the territories of the Aedui and the Sequani into the Rhône with an extremely sluggish current, so that the eye cannot tell in which direction it is going. The Helvetii were crossing this river on rafts and small boats tied together. On learning from his patrols that they had got three quarters of their forces across, but that the remaining quarter was still on the east bank, Caesar left camp with three legions some time after midnight and came into contact with the division that had not yet crossed. Attacking them unexpectedly when they were hampered by baggage, he destroyed a large number, and the rest took to flight and hid in the neighbouring woods.