.login/.cshrc

[& de Jong]

I just discovered that in a login shell of the csh, first the .cshrc
is executed and after that the .login. This is opposite to my intuition,
since I always used to think that the .login file can be used for setting up
some prerequisited  useful for a whole login session, like some environment
variables. And therefore also possible to use them in the .chshrc file, for
setting up a sub shell.

Can someone explain to me why it's not done like?
Thanks in advance.