 Following the allies' defeat at Tanagra in 457 BC, the alliance began to fall apart, resulting in its dissolution in 451 BC.Argos remained neutral or the ineffective ally of Athens during the Archidamian War between Sparta and Athens.Argos' neutrality resulted in a rise of its prestige among other Greek cities, and Argos used this political capital to organize and lead an alliance against Sparta and Athens in 421 BC.