Signed by 93 leading German academics including the people who brought him to Berlin and people who he most values Haber and above all Max Plank,
the manifesto says Germany had to fight;
it was justified and morally acceptable to fight this war.
And this shocked Einstein in effect a betrayal.
This was the moment when Einstein realized that there were something’s about life outside physics that were important enough that he had to actually go out on a limb,
take some personal risk to defend.
He actually tries to present a counter manifesto of other German academics who say no.
There is something else out there besides national pride,
national competitiveness, national fury and four people signed the manifesto.
There is no where never published it fails.
He becomes a pacifist; he becomes a war resistor.
And Einstein is nearly alone: he is isolated;
he is being rejected by his colleagues; his marriage is breaking up;
he is having a custody battle for his kids; he immerses himself in the science.