Martha Raddatz.

The contracting group's aggressive tactics gave its critics ammunition. In September 2007, one Blackwater team coming to the aid of another after a car bombing fired on approximately three dozen Iraqi civilians, killing at least 11 people, including a 9-year-old boy. A handful of Blackwater members now face manslaughter charges related to the confrontation. While they deny any wrong-doing, the incident led to Blackwater's eventual expulsion from Iraq.

But for Prince, the charges are all politics.

"If the amount of scrutiny paid to that event was paid to every other shooting of any U.S. forces or other contractor forces, it would tie up the Justice Department for the next decade," Prince said.

"War is dangerous. It is difficult, and unfortunately, civilians get killed," he added.

Prince told Raddatz his biggest regret1909 10HP Kerosene Blackstone oil engine was used for pumping water from a river to a market garden. The engine was sabotaged in the 1920s by someone blowing up the cylinder with explosives.

A new cylinder was installed and the engine was returned to service for a number of years when it eventually fell into disuse. A number of river floodings submerged the engine and it was eventually partially buried in silt.

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It was recovered in the 1990s and in 1997 it was dismantled, cleaned and started again after many years of neglect.

The starting procedure requires heating of the hot bulb with a blow lamp in order to vaporise the fuel ( kerosene ) and to preheat the internal combustion chamber to allow fuel ignition.