The time is ca 58 BCE

The Helvetii begin to stockpile supplies.   Their plan is to do this for two years and leave their homeland the third year. According to Caesar, after burning their fields, twelve towns about 400 villages they set out to unify Gaul against Rome.

In preparation, Orgetorix, having been appointed to lead them and acting as ambassador to the Aedui and others, attempts to secure alliances, but his plan backfires, he is brought to trial in chains and soon afterward, he dies.   Caesar records in De Bello Gallico,Book 1 - Chapter 4, that the Helvetti think Orgetorix has committed suicide.

Nevertheless, they manage to acquire some allies and begin to execute their original plan under new leadership.   They take to the road with ill-fated results.

The excerpt from the Helvetii entry in the online version of the 1911 Encycopedia.

http://42.1911encyclopedia.org/H/HE/HELVETII.htm

Helvetii

. . . a Celtic people, whose original home was the country between the Hercynian forest (probably the Rauhe Alp), the Rhine and the Main (Tacitus, Germanic, 28). In Caesar’s time they appear to have been driven farther west, since, according to him (Bell. Gall. ~. 2. 3) their boundaries were on the W. the Jura, on the S. the Rhone and the Lake of Geneva, on the N. and E. the Rhine as far as Lake Constance. They thus inhabited the western part of modern Switzerland.

*Passing the baton to you, Sceolan*