At some point on his march to the Sabis, Caesar reorganised the column and reverted to his usual tactic of leading his forces with six legions in light marching order. Behind them was the baggage column of the entire army, followed by the newly recruited legions, XIII and XIV. Caesar does not say whether this change was fortuitous or was made in response to the intelligence received. While Caesar's force began to set up camp on the slope running down to the river, his cavalry, together with slingers and archers, was ordered to cross the river to reconnoiter. This developed into a skirmish with the few troops of Belgic cavalry that had been observed on the far side. Caesar describes the enemy cavalry as sallying repeatedly from the woods at the top of the hill and says his cavalry did not dare follow them in when they retreated. He does not elaborate further so it will never be known if the Nervii were trying to entice the skirmishers onto their hidden position or holding them in play on the slopes in preparation for the planned rush.