The only recording I can find that seems to "Sebastopol" similar is Cheer, Boys, Cheer! (click to listen), a song of Confederate soldiers from the U.S. Civil War.

I found lyrics and a MIDI at http://www.civilwarpoetry.org/confederate/songs/cheer.html

CHEER, BOYS, CHEER!
Lyricist Unknown

CHORUS: Cheer, boys, cheer! We'll march away to battle!
Cheer, boys, cheer, for our sweethearts and our wives!
Cheer, boys, cheer! We'll nobly do our duty,
And give to the South our hearts, our arms, our lives.

Bring forth the flag, our country's noble standard;
Wave it on high till the wind shakes each fold out.
Proudly it floats, nobly waving in the vanguard;
Then cheer, boys, cheer! with a lusty, long, bold shout.

CHORUS

But as we march, with heads all lowly bending,
Let us implore a blessing from on high.
Our cause is just, the right we're defending,
And the God of battle will listen to our cry.

CHORUS

Tho' to the homes we never may return,
Ne'er press again our lov'd ones in our arms,
O'er our lone graves their faithful hearts will mourn,
Then cheer, boys, cheer! such death hath no alarms.

CHORUS

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Click to play

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There's another version, almost exactly the same, from an online copy of this book:

Southern War Songs Camp-Fire, Patriotic & Sentimental 200+ Song Lyrics Collected, Arranged & Illustrated, By W. L. Fagan
Published By M T. RICHARDSON & CO New York, circa 1890
http://www.traditionalmusic.co.uk/southern-war-songs/southern-war-songs%20-%200344.htm

song title: MORGAN'S WAR SONG.

The opnly part different is a bit of the wording from the third verse:
But as we march, with heads all lowly bending,
Let us implore a blessing from on high;
Our cause is just—the right from wrong defending;
And the God of battle will listen to our cry.
Cheer, boys, cheer! etc.