As the two Pennsylvania columns battered their way forward, a double liaison service was maintained between them, first by patrols of men and second by telephone communication. The service of communication was presided over by Colonel Walter C. Sweeney, chief of the divisional staff, originally a Philadelphian, but now hailing from Virginia. The circuit of communication was not broken once, largely because of the alertness and ability of Lieutenant-Colonel Sydney A. Hagerling, of Pittsburgh, the divisional signal officer, and the staunch, untiring and efficient work of the 103d Field Signal Battalion. Each brigade commander knew always precisely how far the other had advanced. Both regular army men, they united in giving full credit for the remarkably successful advance to the high quality of the troops, the superb handling of the artillery by Brigadier-General Price and the unexcelled teamwork of officers and men of each branch of the service and of branch with branch. At one time, emphasizing this remarkable spirit within the division, Major-General Muir appeared in the front lines one morning, just as the first wave of infantrymen was about to go over in a charge against a machine gun nest. Standing talking to the regimental commander, General Muir fidgeted for a few moments and then said: "I think I'll command one of those companies myself." To the amazement and great glee of officers and men, he did, the commander of the chosen company acting as second in command. Enemy shells landed all about the General, who manifested as much agility and energy as the youngest private. A shell fell within twenty-five feet of him, but fortunately it was a "dud," or one which failed to explode. There was vicious machine gun fire all about, but the nest was cleaned out and prisoners and guns were captured. General Muir rejoined the Colonel. He was breathing hardly faster than usual as he remarked: "That was fine! It took me back to the old days in the Philippines." A few days later, the General was out again among the troops, accompanied by Colonel Sweeney, Captain Theodore D. Boal, of Boalsburg, Pa., Lieutenant Edward Hoopes, of West Chester, and Corporal Olin McDonald, of Sunbury, all of his staff. German planes were hovering overhead and suddenly one of them dropped like a plummet to a few hundred feet above the ground and began to spit machine gun bullets at the group. A wounded soldier had just come out of the woods, stood his rifle against a tree and started back to a first aid station. General Muir seized the rifle, took careful aim at the flyer, about three hundred feet above, and fired twice. Whether he scored a hit could not be determined, but the airman fled after the second shot.