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Yeats’ Leda and the Swan is based on the Greek myth where the god Zeus came to Leda, the Queen of Sparta, in the form of a swan and raped her. Leda gave birth to eggs and hatched her children, Helen of Troy and Clytemnestra. The first stanza of this sonnet starts out with Zeus’ aggressive force, “A sudden blow: the great wings beating still” and Leda’s helplessness, “By the dark webs, her nape caught in his bill, He holds her helpless breast upon his breast.” (pg. 1125)
The second stanza in the octave goes into detail about the sexual encounter in this bizarre story. The first line in the sestet signifies the turning point, the climax, in the story. “A shudder in the loins engenders there.” But the story doesn't end there.
First, let me give a little background info regarding the Trojan War. (This is not part of the poem.) The story goes that Helen of Troy, Leda and Zeus’ daughter, was the most beautiful woman in the world. Helen was married to Menelaus, but was abducted by Paris and taken to Troy. This started the Trojan War. You probably know the story of the Trojan Horse, the giant wooden horse filled with Greek warriors. The Trojans thought the horse was a sign of surrender, so they brought it inside the city gates, and began celebrating their victory. Later that night, the Greek warriors emerged from the horse, opened the gates letting the rest of the Greek warriors in, and they proceeded to destroy the Trojan soldiers and burn the City of Troy.
Thus, line 10: “The broken wall, the burning roof and tower.”
Leda’s other daughter, Clytemnestra, was married to Agamemnon. Agamemnon was the leader of the Greek soldiers during the war. While he was away at war, Clytemnestra took another lover and together they plotted to kill Agamemnon when he returned from war.
Line 11: “And Agamemnon dead."
So, one could surmise that the Trojan War and Agamemnon's murder were an indirect result of Leda and Zeus' union.
The last three lines of the sonnet are unclear in their meaning. “Being so caught up, So mastered by the brute blood of the air,” This refers to Zeus' forceful molestation. “Did she put on his knowledge with his power Before the indifferent beak could let her drop?” Did Leda gain any of Zeus' power and knowledge from the affair? Zeus is portrayed as being indifferent when it was finished. But the events that followed were very powerful.