xxxix army corps combined forces with 2nd panzer division to attack châlons-sur-marne on 12 june and delegated the task of capturing vitry-le-françois to 29th infantry division and 1st panzer division. on the right flank, xli army corps advanced via somme-py towards suippes. at châlons, the vanguard prepared to cross the marne river, but failed to check if the bridge they used had been rigged with explosives. the unit suffered numerous fatalities when the bridge was detonated by the allies. 1st panzer division reached bussy-le-château by nightfall and was instructed to next target étrepy and thus the marne–rhine canal.