Ahead of him, the main fleet of robot warships swept into the human-infested system, overwhelming the crews of surprised sentry vessels like an avalanche out of space. Human picket ships opened fire, defenders swept in to meet the oncoming machine force. Five League sentry vessels fired off heavy salvos, but most of their projectiles were too slow to hit the streaking inbound fleet. A handful of robotic vessels were damaged or destroyed by lucky shots, and just as many human ships exploded in flashes of incandescent vapor -- not because they posed a particular threat, but because they were in the way.