The phrase "prolonged battle" refers to a fight or conflict that lasts for a long time, often with both sides struggling to gain an advantage or achieve victory. Full definition
The debate in Nashville echoes themes the nation has heard from New York City and Los Angeles where students, teachers and parents have engaged in prolonged battles over decisions to co-locate charter schools in public school buildings. (salon.com)
Spurred by talk show hosts like Rush Limbaugh, many Republicans decided to switch parties and vote Clinton — either to prolong her battle against Obama or because they believe that she is easier to beat than Obama in the general election. (legalblogwatch.typepad.com)
The space agency is likely to face prolonged battles on the Hill over the funding required to build the rocket. (sciencemag.org)