Which new technology keeps civilians safer during war?

Smart weapons.

Explanation:

The need to develop smart weapons arose from the global demand to lessen civilian causalities during war conflicts. Allowing to avoid carpet-bombing whole cities, smart weapons reduced civilian causalities.

Furthermore, smart weapons don´t need as much proximity to the target, which served in decreasing the risk of losing war assets.

the event is known to be the soviet union.

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.