There are 3 main chord progressions in this song.  Ill call them the VERSE, the CHORUS and the FILL 
 
VERSE 
Am                                     D    
Gus checked his pocket-watch it was a quarter past nine 
Am                                            G            E 
He caught a train to Baton Rouge and bought a copy of the times. 
Am                               D 
Pulled out a faded picture of a woman with coal black hair 
         F                     E 
She had gone out east and he prayed he'd find her there. 
 
She met a gambler who said hailed from New Orleans 

Gus knew he fancied her but she wanted him too it seemed  

He followed the trail of broken stories till he heard that she left town, 

She was packed and gone by the time he turned around 
 
FILL: 
C      G     Am        C     G      E 
(back to verse chords) 

He talked to the man a while that had tore the ticket stubs 

If he finds that son of a bitch he was gonna spill that Cajun blood 

There would not be a mojo man who would save him from that day 

He had crossed the line and there'd be hell to pay 

Well the 10 o'clock from San Antone it departed right on time 

He lit up a cigarette as the tracks began to whine 

The Texas heat had felt like hell without his woman there 

The Spanish maiden with the coal black hair 
 
FILL 
( C  G  Am    C  G  E ) 

              Am           F                       C                G 
You're gonna live and die by the blade and you'll reap what you sow 
       Am                   F              C              G 
Cause life the things that happens on our way to growing old 
        Am                 F                C                G 
If the truth was known to woman she could steal her lover's soul 
Am                   E            Am 
She knows that the devil pays in gold.  
 
FILL  
( C  G  Am    C  G  E ) 
(back to verse chords) 

The pulled into the station and he packed his cap and ball 

He went to check the hotels if he needed to check them all 

He knew all he needed to do was to find a game of card 

And he could drop the ace of spades on the queen of hearts 
 
He found the downstairs card room where the high rollers stayed 

One chair stood empty from the last table left to play 

He pulled a stool up to the bar but he could not see a thing 

Till a loud mouth Yankee bet his lady's ring 

FILL  
( C  G  Am    C  G  E ) 
Pulled a pistol on the desk clerk cause he would not take a bribe and then he shouted 

Give me their number and you might walk out alive 

The next thing from the clerk's lips was the number forty-four 

And he pointed upstairs and he ran on out the door 

He found the room and was ready to go inside 

He put a boot to the door and it flung open wide 

The gambler he reached for his gun but he would not get a shot 

Gus had his aim and he let that hammer drop 
 
FILL  
( C  G  Am    C  G  E ) 
CHORUS 
C   G   Am   C   G   Am   C   G   Am   Am   E   Am   E 
(strum once) 
 
(back to verse chords only strum once) 

The gambler lay before him he was sprawled across that chair 

But where was his maiden with the coal black hair 

He didn't know she stood behind him , she had gone for wine and bread 

He hit the floor when her bullet struck his head. 
 
FILL  
( C  G  Am    C  G  E ) 
CHORUS