Before going to the battlefield, Jack required a lot of information about the battlefield. Of course all of the information was provided to him by his mother. And the moment that he received the information, the information was multiplied by 100 times.
After the multiplier effect was applied, the information that he received was intense. It turned out that the battlefield was created by the other civilization, and not the members of the blue planet.
This came to him as a surprise considering that he was not expecting that the members of the other civilization were the ones that were going to create a battlefield, just to make sure that they did not affect the entire planet.