Good day, Madam
My name isn't Adam
I was the man
Who had two plans
The first one succeeded
The second, also needed
Did not work, and at that
A tip of my hat
To the Yanks, who completed
The work that defeated
This good man, never odd or even
Though able was I, I was not quite forgiven

Who am I?

Edit: I made a small and immaterial change to the first line of the riddle just to make it a bit more poetic. And here is a first hint to get you started (more coming soon if the riddle isn't solved):

Hint:

I am a historical figure, but you probably never heard of me.

Good day, Madam
My name isn't Adam
I was the man
Who had two plans
The first one succeeded
The second, also needed
Did not work, and at that
A tip of my hat
To the Yanks, who completed
The work that defeated
This good man, never odd or even
Though able was I, I was not quite forgiven

Who am I?

Edit: Here is a first hint to get you started:

I am a historical figure, but you probably never heard of me.

Edit: And here's another hint (added after the riddle was solved):

But you definitely heard of some of the achievements I'm famous for, alluded to in the riddle.

[random text to prevent the first line of the riddle from being deleted by the StackExchange software - please ignore]

Hello Madam
My name isn't Adam
I was the man
Who had two plans
The first one succeeded
The second, also needed
Did not work, and at that
A tip of my hat
To the Yanks, who completed
The work that defeated
This good man, never odd or even
Though able was I, I was not quite forgiven

Who am I?

Good day, Madam
My name isn't Adam
I was the man
Who had two plans
The first one succeeded
The second, also needed
Did not work, and at that
A tip of my hat
To the Yanks, who completed
The work that defeated
This good man, never odd or even
Though able was I, I was not quite forgiven

Who am I?

Edit: I made a small and immaterial change to the first line of the riddle just to make it a bit more poetic. And here is a first hint to get you started (more coming soon if the riddle isn't solved):

Hint:

I am a historical figure, but you probably never heard of me.