McGee alone knew the danger and hazard of their mission. In a big push the enemy planes would be out in great number, determined to sweep the air free of resistance. To harass troops, McGee knew, they must fly low. In so doing they would run a constant gauntlet of machine gun and rifle fire, in addition to frequently traversing the line of flight of high angle heavy artillery. It was not pleasant to think of meeting up with one of those big G.I. cans loaded with enough high explosive to demolish a building. Just get in the way of one of them and what would be left could be placed in a small basket. Added to all this was the fact that all altitude was sacrificed, and a green pilot, out cutting eye-teeth, needs altitude in case of attack. To McGee the outlook was gloomy enough. Doubtless the venture would run up a stiff casualty list, but every needed sacrifice must be made here! And now! The French and Americans below must not let the Hun break through. Paris, all too near, was the objective of the drive. If they broke through and reached Paris--well, they must not break through! McGee saw the planes of another American squadron working up toward the front on his left. High above his flight was a large group of French Spads. He watched them, turning his head aloft from time to time. They seemed to be hovering over him and following his course. Far ahead, and below, he could see enemy observation balloons straining at their cables. Black geysers of earth, sand, and mud, were spouting from the tortured strip along the river. The earth below was an inferno of flashing, thundering shells. The front! And the drive was on! He glanced up again. The French Spads were still above, a trained, experienced group of war hawks sent up to take care of the "upstairs" fighting while the Americans did the dirty work below. Cowan had not mentioned this. Perhaps he did not know of it. McGee knew that in big operations, and especially in such emergencies as this, orders were issued without disclosing the whole plan to all participants. If each unit obeys and carries out the orders received, then all goes well. So far, all was well, and McGee was extremely grateful for that protecting flight of Spads. He determined to cross the river west of Dormans, make a thrust well back of the lines, cut out again over Dormans and then, if luck were with them, repeat the performance. No need to lay plans too far in advance. Too much can happen in the tick of a second--things that knock plans and the planner into a cocked hat. Below them now was a far-flung battle of raging intensity. German troops could be seen moving along toward the river, and a little farther inland McGee spotted a long line of infantrymen along a road paralleling the river. But they were moving westward, in the direction of Chateau-Thierry, instead of toward the bridgehead at Dormans. And in addition to the marching men, the road was choked with artillery, caissons, ammunition wagons, and ambulances.