A private Pennsylvania military academy has sued a group of disgruntled alumni in the latest salvo of a divisive fight over the school’s leadership and direction, reports The Philadelphia Inquirer.

Valley Forge Military Academy & College says the graduates’ group, Valley Forge Old Guard Inc., has done “irreparable harm” to the school and its foundation by using copyrighted symbols and images on its Web site and literature.

The alumni group has been at odds with the academy since July 2005, when Valley Forge trustees hired the school’s first civilian president.