WE ARE COMING FATHER ABRAHAM, 300,000 MORE
Words: James Sloan Gibbons
Music: Stephen Foster

We are coming, Father Abraham, three hundred thousand more,
From Mississippi's winding stream and from New England's shore;
We leave our plows and workshops, our wives and children dear,
With hearts too full for utterance, with but a silent tear;
We dare not look behind us, but steadfastly before,
We are coming, Father Abraham, three hundred thousand more.

CHORUS:
We are coming, coming our union to restore,
We are coming, Father Abraham, with three hundred thousand more.

If you look across the hilltops that meet the northern sky.
Long moving lines of rising dust your vison may descry;
And now the wind an instant, tears the cloudy veil aside,
And floats aloft our spangled flag in glory and in pride;
And bay'nets in the sunlight gleam, and bands brave music pour,
We are coming, Father Abraham, three hundred thousand more.

If you look all up our valleys, where the growing harvests shine,
You may see our sturdy farmer boys fast forming into line;
And children from their mothers knees are pulling at the weeds,
And learning how to reap and sow, against their country's needs;
And a farewell group stands weeping at every cottage door,
We are coming, Father Abraham, three hundred thousand more.

You have called us and we're coming, by Richmond's bloody tide,
To lay us down for Freedom's sake, our brother's bones beside;
Or from foul treason's savage group to wrench the murd'rous blade,
And in the face of foreign foes its fragments to parade;
Six hundred thousand loyal men and true have gone before,
We are coming Father Abraham, three hundred thousand more.

Random House's 1946 "A Treasury of Stephen Foster" prints the first two verses and chorus. From that edition's notes by John Tasker Howard:
"When this song was published, in 1862, the title-page read: 'Music composed by Stephen C. Foster.' No authorship was given for the words, and Foster may not have known that they were written by James Sloan Gibbons, an Abolitionist writer, who published them soon after Lincoln issued a call for an additional three hundred thousand troops. For many years the verses were widely attributed to William Cullen Bryant, who finally issued a public denial of authorship."

In the thread linked to by Q in his first post above, Masato gives this link to the original sheet music.