Between a thrilling firetruck-ambulance-civilian truck chase and Foster's (Annie Ilonzeh) blowup with Brett (Kara Killmer), there were plenty of memorable moments in Chicago Fire's exciting midseason premiere on Wednesday. The episode, titled "Hold Our Ground," saw Casey (Jesse Spencer) track down missing firehouse equipment while Kidd (Miranda Rae Mayo) played mediator in Brett and Foster's interpersonal dispute.