HBO Max and Sky release the first look trailer and images for “War,” a London-set legal drama starring Dominic West and Sienna Miller as a married couple embroiled in a divorce dispute. The series follows West’s character, a tech entrepreneur, and Miller’s character, his estranged wife, as they pursue competing strategies in an elite legal environment. Multiple sources describe the conflict as escalating into a high-stakes battle between two top London law firms: Cathcarts & Sons and Taylor & Byrne. The trailer footage presents the couple and their representatives as they confront a contentious divorce that drives events across courtrooms and other influential spaces. The story also introduces young lawyer Jonathan “Johnny” Warren as he is drawn into the firms’ power struggles. The outlets state that “War” premieres in fall 2026 and is produced as a UK production for Sky, while HBO Max will release it in the US at the same time. Additional casting named across the coverage includes Archie Renaux, Marisa Tomei, Kelly Macdonald, David Harewood, Richard Schiff, and others.