Using the chariots and swordsmen is a good idea. According to your advice, I didn´t wait for the Gauls to attack me, but struck them immediately at Alesia. This led me into a more than 30 years war with the Gauls, who stood firmly against my forces, Spain and the Julii and conquered all of Spain and the North of Italy.

During my conquest, I experienced it to be the best tactics to have swordsmen or warbands advance, leading the chariots around the flank of the enemys forces and striking from behind, after hand to hand combat had started. This usually set the enemy on the run.

I´ve also been starting to use stone slingers recently, as they can significantly reduce the numbers of barbarian infantry...especially if it does not dare to attack due to the war cries of my forces.

The most important thing to me still remains the use of an experienced General in combination with highly experienced troops.

P. S. Don´t use your light chariots in city assaults...they will get split up in the roads and surely lose their way...