Airdate: WarDominic West and Sienna Miller star in high-stakes British divorce drama. HBO and Sky Original legal drama series War will premiere on HBO Max in October. War is co-produced by New Pictures (a Banijay company) and Observatory Pictures, in association with Sky and HBO. The series has been greenlit with a two-season order from HBO and Sky and is currently in production on season two. Marisa Tomei, Kelly Macdonald and David Harewood will star in the next headline-making legal battle, as their lawyers become embroiled in an explosive defamation case.