The Germanic cavalry, although outnumbered by Caesar's Gallic horsemen, made the first attack, forcing the Romans to retreat. Caesar describes a characteristic battle-tactic they used, whereby horsemen would leap down to their feet and stab enemy horses in the belly. Accusing them of violating the truce, Caesar refused to accept any more ambassadors, arresting some who came requesting a further truce, and led his full force against the Germanic camp. The Usipetes and Tencteri were thrown into disarray and forced to flee, pursued by Caesar's cavalry, to the confluence of the Rhine and Meuse. Many were killed attempting to cross the rivers. They found refuge on the other side of the Rhine amongst the Sicambri (or Sugambri).