On the top of the hill overlooking the palace grounds the two Martian weapons were placed on the ground, side by side. Damis carefully aligned the red rod on the Viceregal palace. When he had it set, with a word of warning, he closed the gravity anchor switch. The instrument settled a trifle on the solid rock on which it was bedded and then was motionless. At a word from Damis, as many of the Terrestrials as could find a hand-rest pushed against it. It was as though they were pressing against the mountain itself. Damis sighted along the rod and adjusted it until it pointed at the center of the building. "So much for that one," he said. "It is the less powerful of the two, but it will be enough to destroy the Sons of God and the Nepthalim who are in the palace. The few who are scattered over the Earth, we can dispose of at our leisure. If the Jovian fleet approaches the Earth from directly above us, we will be able to destroy it easily. In any event, this weapon is to be used only when it is approximately normal to the surface of the Earth. We must have it almost under the point from which the Jovians are approaching. That may be on the opposite side of the Earth." "I think not, Nepthalim," said Toness. "We know that Glavour and Tubain have been in constant communication since the Jovian fleet passed Mars and he expects them to land here. There would be no object in their taking a circuitous route, so they will probably drop directly down in the palace grounds." "Let us hope so, Toness. In any event, we might as well anchor the weapon here as elsewhere." * * * * * He set the weapon with the blue rod on another patch of bare rock and tested the rod to make sure that it revolved freely and could be made to cover the entire heavens from horizon to horizon. He closed the gravity anchor switch and again the efforts of a dozen Terrestrials were futile to move it. "Now we are ready for their attack," he said to Turgan. "You are as familiar with these weapons as I am, but I will instruct a dozen of your followers in using them. It is possible that we may not be able to operate the weapons ourselves." "I can operate one weapon while you manipulate the other, Damis," replied the Kildare. "However, no harm will be done in instructing others." "I may not be here," said Damis briefly. Without replying to the questions of Turgan and Toness, he proceeded to instruct a dozen of the Earthmen in the use of the terrible Martian weapons. When he was certain that he had a half dozen men capable of attending to each of the weapons, he turned to Turgan.