While the Security Council has been mandating peacekeepers to protect civilians since 1999, there is still contention on its legal meaning. Even though the concept of 'protection' can seem self-evident, as the concept of 'protection' is borrowed language, each body of law will perceive 'protection' through a different lens. However, as the mandate creates a legal obligation on UN peace missions, a clear understanding of protection is fundamental to ensure performance and accountability.