Julius Caesar Gallic War 7.10

This action caused great perplexity to Caesar in the selection of his plans; [he feared] lest, if he should confine his legions in one place for the remaining portion of the winter, all Gaul should revolt when the tributaries of the Aedui were subdued, because it would appear that there was in him no protection for his friends; but if he should draw them too soon out of their winter quarters, he might be distressed by the want of provisions, in consequence of the difficulty of conveyance. It seemed better, however, to endure every hardship than to alienate the affections of all his allies, by submitting to such an insult. Having, therefore, impressed on the Aedui the necessity of supplying him with provisions, he sends forward messengers to the Boii to inform them of his arrival, and encourage them to remain firm in their allegiance, and resist the attack of the enemy with great resolution. Having left two legions and the luggage of the entire army at Agendicum, he marches to the Boii.