The Liberty ships, known in the MN as 'Sam' boats could be said to be 'the ships that won the war'. After scratching round to find any songs about them, and failing, I ended up writing this :-

They were designed by Pickersgill, built by Beth'lam Steel
Down the slip in just six weeks from the day they laid the keel
Crude as a sawn off shot gun, no elegance or style
They were cut off by the furlong, they were laid down by the mile.

Chorus
They were the Sam boats, the Sam boats, built in hundreds, built in scores
These ships built by Uncle Sam were the ships that won the war.

Now every yard in Britain was working day & night
But the 'wolf-packs' they were winning the North Atlantic fight
So Roosevelt said to Churchill 'If you'll send us the plans
We'll build all the ships you need, isolationists be damned'!

So they rolled, and, cut, and welded with their 'Yankee Doodle Day'
And down each slip they were launched, from Maine to Mobile Bay
With a single 'up & downer', greyhounds they were not
Yet 10,000 tons they carried at a speed of near 12 knots.

'Sam Tampa', and 'Sam Verra', they'd strange, outlandish names
But they carried tanks, they carried guns, shells and aeroplanes
But more than munitions, they carried faith & hope
The 'press' called them the Liberty ships, to their crews they were 'Sam Boats'.