That would be the 'battle for Hoth' scene, and teh rebels lose due to Teddy and his suspect driving skills.
(He takes out half the rebel line while trying to cross the trench in his Oldsmobile snowspeeder, then gets out and runs to the bar and claims he wasn't driving. Oldsmospeeder gets crushed by AT-AT.)
But did he leave Harry and Joe at da bottom of da canal?