a series of campaigns against Germanic tribes
... that the Romans won a series of campaigns against Germanic tribes after the disaster at Teutoburg but decided to leave Germany as the effort was out of proportion to the territory's value?
... that the Romans won <b id="mwBdM"><a href="./Roman_campaigns_in_Germania_(12_BC_–_AD_16)" id="mwBdQ" rel="mw:WikiLink" title="Roman campaigns in Germania (12 BC – AD 16)">a series of campaigns against Germanic tribes</a></b> after the <a href="./Battle_of_the_Teutoburg_Forest" id="mwBdU" rel="mw:WikiLink" title="Battle of the Teutoburg Forest">disaster at Teutoburg</a> but decided to leave Germany as the effort was out of proportion to the territory's value?