How did Mazer Rackham defeat the buggers in the second invasion

Ender is curious about how Mazer won against the buggers by targeting just one ship. Mazer is not sure, but he thinks that the buggers' instantaneous mind-speak is not really a conversation at all. It seems that one bugger, the Queen, controls all of the others. When Mazer destroyed the Queen ship, all of the other buggers were destroyed along with her. "Every ship acts like part of a single organism."