War always goes for the infrastructure: take out the bridges, cut off the electricity and water supplies. All that used to be done with artillery, tanks and bombs.

Going forward, it will be done by computers: Cyberwar.

Every day the early skirmishes — the tryout phase, if you will — are taking place. There are tens of thousands of probes of U.S. infrastructure by potential enemies, known and unknown, state and non-state. A few get through the defenses.

Jeremy Samide, chief executive officer of Stealthcare, a company that seeks to improve cyberdefenses for a diverse set of U.S. companies, sees the cyber battlefield starkly. He says the threat is very real; and he puts the threat of serious attack at 83 percent.

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