In the latter part of October, 1930, Robert returned to Denver, Colorado, where General Pearson had moved the aviation headquarters, and was moving heaven and earth to prevent the advance of the enemy toward the East. Many people on the coast had become frightened and moved to Denver for protection. Robert brought the new invention which he called the "Radio Annulifier." The Spaniards and Japanese were making use of Robert's secret radio, which was one of the most valuable discoveries up to that time. The Annulifier was now placed on scouting airplanes and they were sent out. They found that it would work a distance of several hundred miles. This disorganized the enemy forces because they did not understand what had gone wrong with the secret mechanism of the Pocket-Radio with which they were able to transmit orders without sound or fear of detection. They had to resort to the old method of using radios and wireless. Robert had invented a new machine to record either sound or communications by light waves. He soon secured the plans of the enemy and reported to General Pearson, who was still in command for the Aviation Corps, that the enemy was planning to attack from the Gulf of Mexico, follow up the Mississippi River, take New Orleans and at the same time make a joint attack across the Great Lakes, cutting off the Government's forces and the wing which was holding across from Denver, Colorado to Canada on the North and the border of Texas on the Southwestern side. When General Pearson received this disappointing news, he realized that the situation was desperate. He communicated with the President of the United States, who immediately called the Cabinet together. All the Army Officers were called in conference to discuss plans as to the best thing to do to forestall the attack. They were forced to admit the painful truth that the fleet of airplanes was not sufficient to withdraw enough forces from the Western line to send to the North and South, to protect Chicago and the Mississippi valley. General Pearson made plain to the War Council the great value of Robert Gordon and suggested that he be restored to his former rank for what he had already done. They agreed with him and Robert Gordon was made Colonel in the early part of November, 1930. Walter Kennelworth, for his great services in working with Robert, was also promoted to Colonel.