Almost at once Agesilaüs remembered the sacrifice of his own daughter which Agamemnon had there made in obedience to the soothsayers.
Edition :
Plutarch Lives V: Agesilaus and Pompey, Pelopidas and Marcellus, Ed. Jeffrey Henderson, trans. Bernadotte Perrin (The Loeb Classical Library 87), Harvard University Press: Cambridge/MA - London 1961 (first ed. 1917).
Remark :
motive: Agamemnon follows orders of the soothsayers (Plut. Ages. 6.5). His act of violence is tactical/strategical, because he ist able to continue his campaign by it. long-term consequence: By this sacrifice Agamemnon is able to continue the campaign he just started.
Notes :
For more information on the myth: https://referenceworks.brillonline.com/entries/brill-s-new-pauly/iphigenia-e526970#e526980