The simultaneous Battle of Artemisium was up to that point a stalemate ; however , when news of Thermopylae reached them , the Allied fleet also retreated , since holding the straits of Artemisium was now a moot point .
DET ADJ PROPN ADP PROPN AUX ADP ADP DET NOUN DET NOUN ; ADV , ADV NOUN ADP PROPN VERB PRON , DET PROPN NOUN ADV VERB , SCONJ VERB DET NOUN ADP PROPN VERB ADV DET NOUN NOUN .