Children of the Lens by E.E. Smith

If the historian has succeeded in his attempt to describe the characters and abilities concerned, it is not necessary to enlarge upon what Kit went through in escaping Eddore. If he has not succeeded, enlargement would be useless. Therefore, it is enough to say that the young Lensman, by dint of calling up and putting out everything he had, hung on long enough and slugged his way through.

Mentor's visualization had been sound. The Eddorian guardians had scarcely taken over the first screen when it was overwhelmed by a tremendous wave of Arisian thought. It is to be remembered, however, that this was the second time that the massed might of Arisia had been thrown against Eddore's defenses, and the Boskonians had learned much, during the intervening years, from their exhaustive analyses of the offensive and defensive techniques of that earlier conflict. Thus the Arisian drive was practically stopped at the second zone of defense as Kit approached it. The screen was wavering, shifting; yielding stubbornly wherever it must and springing back into place whenever it could.