In a power conflict the leader with higher power will usually win regardless of rightness of issue, and a person convinced against his will is of the same opinion still. (The Making of a Leader, Robert Clinton, p179)
I learnt this one early in ministry. It takes some humility and wisdom to know which battles to fight and what is of primary importance and what is secondary. Too often leaders who are used to leading their own team misunderstand how to relate to leaders over them. John Maxwell’s book - 360° Leadership - is another excellent resource to help you understand the different skills and dynamics involved.