On one occasion in September 1918, Keith's quick thinking and resourceful nature saved him from certain death. Whilst on a patrol, another S.E.5a struck his aircraft, catastrophically damaging his wing struts and altering the aircraft's aerodynamics. Instantly his fighter plummeted 1000 feet and went into a flat spin. Keith knew he was doomed if he didn't attempt something radical. So he stepped his left leg out onto the port wing, and grabbed hold of the strut with his left hand. Attempting to balance the aircraft by changing the centre of gravity, Keith continued to try to fly the aircraft with his right hand on the joystick.
With only 500 feet of altitude left he realised it was hopeless, but this activity had allowed him to guide the aircraft away from enemy territory and over the British lines. Just as the plane was about to impact with the ground Keith jumped, clearing the wreck and getting up to find he'd landed in front of a British infantry dugout. Astonished soldiers saw him get up, dust himself off and walk towards them as if nothing had happened. Escaping the flat spin, guiding the plane away from enemy lines and then jumping clear at the last minute and walking away from the crash is nothing short of a miracle.
Like all amazing tales of heroism such as this, there are different versions. The above was related from a June 1945 article by H.H. Russell in Contact. But the book By Such Deeds by Colin Hanson records the altitudes slightly differently, stating:
"WWI history records that: "in Sep 1918 when attacking German aircraft over the Cambrai sector a member of his formation collided with him buckling his starboard upper wing and forcing him into a dive. After his aircraft had lost about 2000 feet of height the dive gradually developed into a right-handed semi-flat spin. At about 5000 feet Caldwell climbed out of his cockpit, placed his left foot on the lower port mainplane and, grasping the port centre strut with his left hand endeavoured to balance his aircraft, flying it with his right hand and foot. Displaying skill and resource of the highest order he succeeded in guiding his crippled aircraft so that it just cleared the front line trenches and, just as it was about to crash, he jumped off and turned a few somersaults on the ground. He then stood up, brushed himself off and walked to the nearest trench asking to use the telephone."