The siege is best remembered for the Melian Dialogue, Thucydides' dramatized version of the talks before it. Its line that the strong do what they can is taken as an appeal to power over justice.
Based on Wikipedia: Siege of Melos
This siege is best remembered for the Melian Dialogue, a dramatization of the negotiations between the Athenians and the Melians before the siege, written by the classical Athenian historian Thucydides.
In particular, the quotation "the strong do what they can and the weak suffer what they must" is taken as an appeal to political power as opposed to justice.