This passage is meant to invoke a sense of national unity towards a common enemy. Wars are often seen as uniting in the sense that they bring people in a nation together.
1. In 2.on 3.from 4.for 5.than 6.in 7.in 8.with 9.of 10.also 11.at 12.and
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The participial phrase in the given sentence is "noted for her beauty". A participial is a word that ends in -ing form (present participle) or in -en (past participle) form that functions as an adjective. A participial phrase consists of the participial and other words that modifies or complements the noun. The participial phrase "noted for her beauty" describes the noun "Helen of Troy".