If "salvo" mean "a verbal attack" here, then "a battle" refers to "the battle that the people who champion an empathetic America fight (against Mr. Trump's philosophy and for the real/traditional soul of America)"?
Thanks in advance
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Mr. Trump's philosophy is an opening salvo in a battle for the soul of America that is only beginning. This will be a battle fought trench by trench. But I think it is winnable and America will reconfirm a governing philosophy that is hopeful, compassionate, and wise about the role of government in making our world a safer, fairer, and more just place to live.
-Dan Rather
Source
Thanks in advance
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Mr. Trump's philosophy is an opening salvo in a battle for the soul of America that is only beginning. This will be a battle fought trench by trench. But I think it is winnable and America will reconfirm a governing philosophy that is hopeful, compassionate, and wise about the role of government in making our world a safer, fairer, and more just place to live.
-Dan Rather
Source
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