Explain how the language in this excerpt develops the mood

They wrapt the ship in splendor wild,
They caught the flag on high,
And streamed above the gallant child
Like banners in the sky.

Then came a burst of thunder-sound—
The boy—oh! where was he?
Ask of the winds that far around
With fragments strewed the sea,

With mast, and helm and pennon fair,
That well had borne their part.
But the noblest thing which perished there
Was that young faithful heart.