Kenneth Bulmer 
Behold the Stars [EPUB ebook] 

White Flag for Earthmen Man had discovered a means of colonising the galaxy. Through a system of instantaneous matter transmission, men, machines, anything, could be sent light years away in seconds!Only, men were not the only beings in the galaxy who were expanding, and at 200 light years from Earth the alien Gershmi people made their claims clear, with guns!It would have been a fair fight between equally matched races, had not the very matter transmitter boxes which had made mankind’s expansion possible, suddenly began to put men back together, 200 light years from Earth, with their will to fight removes, so that Earthmen were marching with white flags of truce straight into Gershmi fire!