ah, you probably aren't killing the tie bombers fast enough. they count the train cars as 'allies' and don't want any of the train destroyed, so the minute you see a part of the train fall apart, you should restart the mission. :/
Battle is a pure form of expression. It is heart and discipline, reduced to movement and motion. In battle, the words are swept away, giving way to actions-- mercy, sacrifice, anger, fear. These are pure moments of expression.