"Five thousand men are stationed within the windows of the domes," replied the officer; "five thousand more comprise the reserve which you see about you, and from which detachments have been detailed to guard the quarries. A mile from the city are four other bodies of infantry; those to the east, north and south having a strength of one thousand men each, while the one to the west, facing the probable point of attack, consists of seven thousand warriors."
"Then you think the fighting will not reach the city?" asked Tarzan.
"No. The lucky men today are in the advance cavalry—they will get whatever fighting there is. I doubt if an infantryman draws a sword or casts a spear; but that is usually the case—it is the cavalry that fights, always."
"I take it that you feel unfortunate in not being attached to a cavalry unit. Could you not be transferred?"
"Oh, we must all take our turns of duty in each branch," explained the officer. "We are all mounted except for defense of the city and for that purpose we are assigned to the foot troops for four moons, followed by five moons in the cavalry"—the word he used was diadetax—"five thousand men being transferred from one to the other the night of each new moon."
Tarzan turned and looked out across the plain toward the west. He could see the nearer troops
