The amount of ongoing cyber attacks (many types) could be compared to a relentless assault with millions of arrows on a given target. Just take a look at the different live Cyber War maps and Cyber Attack or Cyber Threat maps.
Cyber Warfare activity is aggressive in nature and is conducted by different entities. It is not reserved to governments and military entities or security forces only. This makes the cyber landscape a threatening and complex combat theatre with multiple attack vectors. After land, sea, air and space, Cyber Space is now recognized as the fifth domain. It is in this 5th domain that Cyber Warfare, Cyber Defense and Cyber Offense are conducted.