True. However, the spacecraft would still be radiating heat for quite a while, as I suspect the primary method of heat dissipation would be radiation. I suppose

True. However, the spacecraft would still be radiating heat for quite a while, as I suspect the primary method of heat dissipation would be radiation. I suppose the spacecraft could carry some form of coolant, and eject it once the engines are shut off, but then the spacecraft would need to eject it while it is very far away from the enemy craft lest the enemy detect the ejected hot coolant. But then the spacecraft could not alter its trajectory, and so it would have to rely on the enemy craft keeping a constant trajectory.