Well I think it was a series of traumatic events during 1940 that led to him cracking under the strain. We never really found out the whole truth but we know he shot unarmed prisoners, endured heavy fighting and air attack and eventually returned to England carrying his best friends head which had been severed in an air raid on Dunkirk beach. After that, Im not surprised he went a little nuts.
He was released but was clearly not suitable to go back to war. From what my Grandmother told us before she died, he had an utterly fatalistic attitude when he returned to service. I think he wanted to do his duty and didnt really seem to care if he lived or died.
After the war he became very bitter that he had been sent back to fight, and subsequently paralysed. Made him very bitter and he never got over that and it sadly effected everyones relationship with him. I think all the grandchildren dreaded going to the house. I know I did but he seemed to be different with me as I was fascinated by all his war memorabilia. He had a vast collection of medals that we used to spend alot of time looking through and talking about. I guess I was lucky to have an interest in the war and this allowed him to forget things for a while when we spent time together.
He stilled scared the crap outta me though! LOL!