Surrender was the act of submitting to another power, typically on compulsion or demand.

In 2007, Cyber-Leader One, after arriving in the Earth of N-Space with an army of five million Cybermen from Pete's World, made a global broadcast from Torchwood Tower ordering the surrender of humanity. Nevertheless, the Cybermen were met with armed resistance, much to the Cyber-Leader's confusion. The Tenth Doctor explained:

They're not taking instructions. Don't you understand? You're on every street, you're in their homes, you've got their children! Of course they're going to fight.The Tenth Doctor. [src]

Plain white flags were typically used in the event of a surrender. The Doctor, holding a sheet of A4 paper on a stick, met a group of Cybermen, jokingly apologising for not having an actual white flag. (TV: Doomsday)

In 2009, following a Dalek invasion of Earth which saw UNIT massacred, the Commander General of the United Nations broadcast a message announcing Earth's surrender to the New Dalek Empire. (TV: The Stolen Earth)

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