Clandestine Mission

As I held my breath to LISTEN,
all was still, except the GLISTEN
of moonlight on the door. These ARE
the ways that I could make or MAR
my task. My cloak provided SLIGHT
protection from the freezing NIGHT.
Crept past the barn where horses NEIGH
and quickly loaded up the DRAY.

Now read this from a different angle:
take the capitalised words; untangle;
the eight initials you will find
will surely put you in the mind
of why I was above suspicion
as my plan came to fruition.

What was I?
[Clue: C C V V C C C C]