Having returned from an exercise the HMS Hero crew are needled about the state of their ship by Captain Calder. Captain Holt rebuffs with a challenge of a pulling race across the Portland docks. When Holt's crew win the race by unfair means this starts a friendly rivalry 'war' between the two crews. This includes a master strike by Holt using Zoe Carter's journalistic talents to 'interview' Captain Calder. As the 'war' escalates it's the CNC's daughter Arabella Ledson who plays a part in defusing the situation.