Answer:
By using this phrase, Dumas is trying to characterise D'Artagnan who is infatuated to Lady de Winter, commonly called Milady.
The eagle is referred to Milady, with whom D'Artagnan is infatuated.
And, the sparrow is Kitty, who tries to flirt with D'Artagnan.
Explanation:
"The Three Musketeers" is a novel written by French author, Alexandre Dumas. The novel shares adventerous journey of D'Artagnan to join the Musketeers of the Guard.
By using the phrase "He who hunts the eagle heeds not the sparrow" Dumas is trying to portray or characterise D'Artagnan, who is infatutated to Milady, a young and beautiful woman. Dumas is trying to convey that that because he was so engrossed with the thought of getting Milady that he did not pay heed or attention to Kitty's flirtatious intentions.
The eagle is referred to Milady in the phrase and sparrow is used to denote Kitty.
