On 16 July 390 BC, a Gallic military under the management of tribal chieftain Brennus, met the Romans on the banking institutions of the Allia River ten miles north of Rome. The city of Rome grew from settlements all over a ford on the river Tiber, a crossroads of site visitors and trade. This triggered a problem, in that Rome arrived to have a huge male populace but was bereft of women of all ages.