The phrase "contentious battle" refers to a situation where there is intense disagreement or conflict between two or more opposing sides, usually fighting to achieve their own interests or goals. Full definition
Litigation attorneys engage in contentious battles to get the best outcomes for their clients. (lawyerist.com)
Some of the most contentious battles are fought over the children. (mccaberussell.com)
The lawsuits show that two of the nation's most contentious battles over the teaching profession are shifting from legislative arenas to the courts, giving judges the chance to make decisions that could shape the way teachers are hired, fired and paid. (washingtonpost.com)