When Lennier returns with proof that the Centauri Republic is behind the sneak attacks on shipping from many different worlds, the Interstellar Alliance holds a hearing to see Lennier's evidence. Centauri Ambassador Londo Mollari is locked out of the meeting; when it is over he enters the chamber and defends the Centauri, but is shocked when Lennier's visual evidence is shown, conclusively proving that Centauri warships have been attacking and destroying unarmed merchant and civilian ships. Hoping to prevent an all-out war between the Alliance and the Centauri, Alliance President John Sheridan orders a blockade of Centauri space; his hope is to prevent either the Centauri or Alliance warships from coming into contact and opening fire. Londo, believing that his people have somehow been "framed", travels to Centauri Prime with Narn Ambassador G'Kar as his bodyguard to find the truth. However, he is unable to personally meet with the Regent, who is mysteriously absent and unavailable for an audience. All he can discover is that the Regent, through his ministers, is insisting that the Interstellar Alliance has provided fake evidence to incriminate the Centauri.
Meanwhile, Michael Garibaldi, the Interstellar Alliance's Director of Covert Intelligence, continues to struggle with his drinking problem, with disastrous results. He shrugs off a warning from Zack Allan, B5's Security Chief and an old friend, who enters Garibaldi's quarters and finds him drunk. Garibaldi successfully pleads with Allan not to report his drinking problem to Sheridan, and Allan, knowing that such a report might end Garibaldi's career, agrees to help him. However, Garibaldi's alcoholism has devastating consequences when he passes out drunk and thus fails to hear a warning from his intelligence officers. They report that several Centauri supply ships, escorted by Centauri warships, are trying to run the blockade near Drazi space. The Drazi are moving to intercept them. When Garibaldi fails to warn Sheridan, the Drazi engage the Centauri in a fierce battle. Soon afterwards, the angry Drazi ambassador to Babylon 5, accompanied by other alien ambassadors, goes to Sheridan and demands the protection of the Alliance's White Star fleet. When Sheridan is unable to talk them out of their demand, he angrily agrees to declare war on the Centauri.
On Centauri Prime, the outbreak of war leads the Centauri ministers to demand that G'Kar, as a representative of an enemy government, be placed in prison. When Londo angrily states that "where he goes, I go" (expecting them to back off), the ministers throw Londo in prison along with G'Kar. Staring out of their prison window at night, Londo and G'Kar watch as Centauri warships patrol the skies over the now-embattled Centauri homeworld.