Conditional surrender

Surrender, in military terms, is the relinquishment of control over territory, combatants, fortifications, ships or armament to another power. A surrender may be accomplished peacefully, without fighting, or it may be the result of defeat in battle. A sovereign state may surrender following defeat in a war, usually by signing a peace treaty or capitulation agreement. A battlefield surrender, either by individuals or when ordered by officers, normally results in those surrendering becoming prisoners of war.

Merriam-Webster defines surrender as "the action of yielding one's person or giving up the possession of something especially into the power of another", and traces the etymology to the Middle English surrendre, from French sur- or sus-, suz "under" + rendre "to give back"; this in turn is defined by the University of Michigan Middle English Dictionary as meaning "The giving up of an estate, a grant of land, or an interest in property to the person who holds the right to it", or, in law, "the relinquishing of letters patent to the king", or "the giving back or return of something".

A white flag or handkerchief is often taken or intended as a signal of a desire to surrender, but in international law, it simply represents a desire for a parley that may or may not result in a formal surrender. Normally, a surrender will involve the handing over of weapons; the commanding officer of a surrendering force symbolically offers his sword to the victorious commander. Individual combatants can indicate a surrender by discarding weapons and raising their hands empty and open above their heads; a surrendering tank commander should point the tank's turret away from opposing combatants. Flags and ensigns are hauled down or furled, and ships' colors are struck.

...
Wikipedia