The Battle in Gethsemane was fought between self & God...
And he went a little further, and fell on his face,
and prayed, saying, O my Father,
if it be possible, let this cup pass from me:
nevertheless not as I will, but as thou wilt.
Matthew 26:39
"The warfare against self is the greatest battle that was ever fought.
The yielding of self, surrendering all to the will of God, requires a struggle;
but the soul must submit to God before it can be renewed in holiness."
Steps To Christ p.43 E.G.W.