Over the winter, there seems to have been some tension between the Allies. In particular, the Athenians, who were not protected by the isthmus, but whose fleet were the key to the security of the Peloponnesus, felt hard done by. They demanded an Allied army march north the following year.[141] When the other Allies failed to commit to this, the Athenian fleet probably refused to join the Allied navy in the spring.[142] The navy, now under the command of the Spartan king Leotychides, thus skulked off Delos, while the remnants of the Persian fleet skulked off Samos, both sides unwilling to risk battle.[142] Similarly, Mardonius remained in Thessaly, knowing an attack on the isthmus was pointless, while the Allies refused to send an army outside the Peloponessus.[141]