Hurray!
The answer is correct, Boromir's horn. Your explanation is also correct, though I had something slightly different in mind for a couple of lines. Here are the quotes to compare to:
Quote:
Putting it to his lips he blew a blast, and the echoes leapt from rock to rock, and all that heard that voice in Rivendell sprang to their feet.
Slow should you be to wind that horn again, Boromir, said Elrond. 'until you stand once more on the borders of your land, and dire need is on you.'
`Maybe,' said Boromir. 'But always I have let my horn cry at setting forth, and though thereafter we may walk in the shadows, I will not go forth as a thief in the night.'
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"I announce great beginnings".
Quote:
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`You remember well, and as one who has in truth seen him,' said Faramir. `Then maybe you can see it in your mind's eye: a great horn of the wild ox of the East, bound with silver, and written with ancient characters.
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"Born in the East", "silver-clad".
Quote:
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it is said that if it be blown at need anywhere within the bounds of Gondor, as the realm was of old, its voice will not pass unheeded.
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Indeed the quote that you picked out for "I did as was foretold".
Quote:
‘Peace!’ said Gandalf. ‘The news of that grief should have been told first to the father.’
‘It has been guessed already,’ said Ingold; ‘for there have been strange portents here of late.
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"But you speak of his death. You have had news of that ere we came?’
‘I have received this,’ said Denethor, and laying down his rod he lifted from his lap the thing that he had been gazing at. In each hand he held up one half of a great horn cloven through the middle: a wild-ox horn bound with silver.
‘That is the horn that Boromir always wore!’ cried Pippin.
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"Herald of death".
And indeed, as you described, the horn that Boromir carried with him across Middle-earth was blown when the orcs attacked him, and was not unheeded, but instead of bringing him timely help only brought pain and worry to his people in Gondor.
Your turn.