Last Thursday, Patton Boggs entered an appearance in the U.S. Court of Appeals for the Second Circuit on behalf of the Ecuadorian plaintiffs accusing Chevron of wreaking billions of dollars of damage in the Lago Agrio region.

It was a notable event in the 17-year-old litigation; as we’ve reported (exhaustively), Chevron has devoted enormous resources to discrediting the Ecuadorians’ lead U.S. plaintiffs counsel, Steven Donziger, so the sudden arrival of an Am Law 200 firm on the plaintiffs side must have been an unwelcome development for the oil company.