We knew to within a million kilometers or so how far away Medeiros would be able to pick up our reactor signatures. We would head outward to 50 AU from Alpha Centauri A, then turn and accelerate inward at 10 g for as long as possible. We would then coast the rest of the way to the area of the Brazilian autofactory at close to 13% of the speed of light, separated by a few minutes to allow a staggered attack. At that speed, there would be no turning around for a second pass in any reasonable time.