Your ship is running at full power and the engines are set for half-impulse. Photons are pre-loaded with anti-matter and power is available for the phaser banks. Batteries are standing by to reinforce the shields. There is the enemy! A crafty Klingon in a D7 Battlecruiser has charged across the border, ignoring your orders to stop or withdraw. He is going to do a fly-by at 80,000 kilometers and tactical intelligence says his disruptors are fully armed! Swing your ship directly into his path. He will learn that going head-to-head with a photon-armed cruiser is not a good career move, and you're hardly going to give him a "drive by" shot at your ship and let him get out of range. Fire photons! Fire Phasers! His shields are down, but your own shields held at least for now. The Klingon turns and heads back for the border, a string of insults sneering over subspace. Congratulations, you're playing Federation Commander on the Klingon Border!