With three other machines, Ingalls was, on September 24, flying over the lines at 16,000 feet elevation, when twelve Fokkers were seen approaching. Though outnumbered, the speedy Allied planes quickly broke up the German formation. The famous British Captain Brown, of Squadron No. 213, swung into and gunned a Fokker after a thrilling high bank, and the German fell to earth three miles below. Another Fokker had got on the tail of one of the Allied machines and by a well-aimed shot punctured its gasoline tanks. Ingalls came to the rescue, fighting off the enemy and in a few minutes shooting him down. The fourth plane was hard at it, too, succeeding in shooting down another Fokker, after following it down to within a few feet of the ground. Thus three Fokkers were accounted for in a few minutes. On another occasion, Ingalls, single handed, attacked six biplanes, driving down one of them and eluding the five pursuers. The first of October he engaged in three successive raids in one day. His second point of attack was a large farm building at Cortemarck, used as a shelter for troops. More than 200 Germans were gathered there. Crashing through the roof, a bomb dropped by Ingalls exploded in their midst, dealing death and destruction. I wish it were possible to recount all the daring deeds performed by our Navy and Marine Corps aviators, who with the British and on their own engaged in constant attacks on the German bases in Belgium, but Ingalls' exploits are enough to give an idea of the work performed by this Northern Bombing Group. And all this was "land duty," a task seldom assigned to navies. The Navy's "regular job," far the greater part of its work, was patrolling the long coast lines, watching for submarines, and furnishing aerial escort for the convoys of troop, supply and merchant ships that moved in a constant stream to and from European ports. Covering vast areas of water, they flew hundreds of thousands of miles, and they were always on the job. Though the U-boats usually "ducked" when a seaplane or dirigible balloon was sighted, aircraft often managed to spot them, and took part in some exciting encounters. One remarkable engagement, a gunfire fight between seaplane and submarine, took place off Dunkirk on August 13, 1918. Four seaplanes left their station for a routine flight in connection with the Dover Patrol. Eight miles off the coast, between Calais and Dunkirk, Ensign J. F. Carson, one of the pilots, sighted a large submarine, with no identification marks, speeding on the surface in the direction of Holland. Carson challenged it by firing a recognition signal. The U-boat opened fire on the seaplane with shrapnel from its forward gun, firing five shots.