It all happened in what Segev depicts as a two-act drama of irrationality between June 5 and 10, 1967. The first act came when, in the throes of a national depression and existential angst, Israel invaded Egypt, destroying its air force and seizing both Gaza and the Sinai Peninsula. The second came a few days later when, in the irrational exuberance of that victory, Israel turned to the north and east, to Jordan and Syria, extending its realm in both directions.
While I haven't finished reading his book (in Hebrew), it is so off-the-mark and retrospectively biased.
I was here 1966-67 so this time I have full personal memories.