"Was Dally gallant?"
Different people could have different opinions. In my opinion, robbing a store, and letting yourself get mowed down by the cops isn't very gallant. Sure, he did it because of Johnny, but it really wasn't heroic. However, him leaving the hospital to help in the rumble is very heroic. If Dally had sacrificed himself (jumping in front of the bullets), then that would of been gallant. But he just killed himself because he couldn't live without Johnny. Maybe he could of been "more gallant" if he didn't get mowed down by those dang cops.