Battle of the Caudine Forks

The Battle of Caudine Forks, 321 BC, was a decisive event of the Second Samnite War. Its designation as a battle is a mere historical formality: there was no fighting and there were no casualties. The Romans were trapped in a waterless place by the Samnites before they knew what was happening and nothing remained but to negotiate an unfavorable surrender. The action was entirely political, with the magistrates on both sides trying to obtain the best terms for their side without disrespecting common beliefs concerning the rules of war and the conduct of peace. In the end the Samnites decided it would be better for future relations to let the Romans go, while the Romans were impeded in the prosecution of their campaign against the Samnites by considerations of religion and honor.

• http://en.wikipedia.org/wiki/Battle of the Caudine Forks