The Celtic cavalry covered all the roads and obstructed the communication.

The town was strongly garrisoned, and the connection between it and the army before the walls was kept open.

Caesar's position was very awkward.
The attempt to induce the Celtic infantry to fight was unsuccessful; it stirred not from its unassailable lines.

Bravely as his soldiers in front of the town trenched and fought, the besieged vied with them in ingenuity and courage, and they had almost succeeded in setting fire to the siege apparatus of their opponents.
The task withal of supplying an army of nearly 60,000 men with provisions in a country devastated far and wide and scoured by far superior bodies of cavalry became daily more difficult.
The slender stores of the Boii were soon used up; the supply promised by the Haedui failed to appear; the corn was already consumed, and the soldier was placed exclusively on flesh-rations.
But the moment was approaching when the town, with whatever contempt of death the garrison fought, could be held no longer.

Still it was not impossible to withdraw the troops secretly by night and destroy the town, before the enemy occupied it.