Princess Principal/Recap/S1/E04 Case 9 Roaming Pigeons

Quoting from Wikipedia: "Dorothy is given a new mission by L to steal a prototype miniature Cavorite device the Kingdom has developed. L also warns Dorothy to keep an eye on Princess, as she might be a double agent. Meanwhile, Ange is training Beatrice and Chise when Princess suggests they come up with a name for their team. Dorothy informs them of their mission and they use Princess' status to infiltrate a ceremony at the mine where the Cavorite device is being held. At the ceremony, it is revealed that Chise is there to observe the Kingdom and Commonwealth on the behalf of Japan so it can determine which country to ally with, and the Duke of Normandy wants to marry Princess off to Russia to secure an alliance. Ange searches for the device but finds out it is being transported out of the city by boat. Princess volunteers to assist in the assault on the boat, which convinces Dorothy that she is not a double agent. The team is able to secure the Cavorite device and capture the entire research team. Dorothy relays the results to L, but he warns her that even though Princess may not be a double agent, she will always be a potential threat. At school, the team decides to name themselves Team White Pigeon."


 * Totem Pole Trench: Done by Ange and Beatrice in order to bluff two guards into abandoning their post during the ceremony.