In 2009, French archaeologists were exploring the site of a new gravel mine when they uncovered a Gallic cemetery dating to the third century BC. Twelve graves were found and excavated: six adults, five children, and one cremation.
Most spectacular were two chariot burials (top and above), both men buried with swords.
Unfortunately I haven't been able to find out much about this site, since there are as yet no scholarly publications and on its web site INRAP has, instead of text I could read, a video in which people speak French too rapidly for me to follow. Here's a picture from the video; notice how the upper parts of the two iron wheel rims were broken off by the plow and lost.