The annihilation of 3 legions at Teutoburger Wald in 9 A.D. made this German river the limit of Roman expansion
[DOC] [TLE] Battle of the Teutoburg Forest - Wikipedia [PAR] The Battle of the Teutoburg Forest described as Clades Variana (the Varian 
Disaster) by Roman historianstook place in the Teutoburg Forest in 9 CE, when 
an alliance of Germanic tribes ambushed and decisively destroyed three Roman 
legions and their auxiliaries, led by Publius Quinctilius Varus.