Some more interesting discussion from the eMule site:

Below is a quote (again from Dennis Hammes) that expands
and clarifies the issues:

Wheelwright, Philip. Metaphor and Reality. Bloomington, IN:
Indiana University Press; 1962.
...may have the best discussion. It was Aristotle who made the
distinction in the /Ars Poetica/. Both of them use definitions based on the
logic and mechanics of language. The distinction you give above is a /much/
better working distinction.

Epiphor is what we now mean by "metaphor." Its vehicle is a
specific and proper subset of the tenor, in at least most examples;
depending on how closely and broadly the known mechanisms of the vehicle map
those of the tenor, it can become extended metaphor or symbol (it's still
ephiphor); simile is epiphor in which the vehicle has only one attribute in
common with the tenor (the flag words "like" or "as" are /not/ andatory or
distinguishing), and so cannot be extended.
Diaphor hunts for or asserts a connection between two things whose
mechanism(s) is(are) not known well enough to make any subsequent estimate
of the comparison; it is commonly said to be "mere," even "accidental"
juxtaposition, but it isn't; the poet has seen/felt /a/ connection, but is
unable to dwell on what it is. The abuse of this technique in a putative
report (the poem) is simply to slap pretties or shockers together
essentially at random to watch the sparks.

A working poet will probably spend most of his time trying to turn diaphor
into epiphor (and not necessarily with his pencil in hand), as the latter
obviously maps (explains) the universe of an observation better. Haiku so
/look/ like diaphor that it is often necessary to dwell on them for some
time to discover just what epiphor the poet has attempted, and how it works
(that is, if he wasn't just banging rocks together).

The above was taken from a thread on the newsgroup
alt.arts.poetry.comments - you can read the whole thread on Google (was
Deja) Groups ,
searching for the thread Ripe for the Wind.

I wouldn't think 'War is hell' would fit, but perhaps something
like 'War is a yellow ribbon', where the connection is not clear.

(Edit: Thanks for the links, wow! And the newsgroup url was provided but the other board deleted it...I haven't arrived at newsgroups yet, so if anyone goes and has the url please post it for others. Thanks!)