Despite attempts to capture the Greek city by treachery,[138] the Persians were forced to keep up the siege for three months.[139] Then, attempting to use an unusually low tide to attack the town from sea, the Persian army was caught by the returning tide, many drowning and the survivors being attacked by the Potideans in boats.[139] Artabazus was thus forced to lift the siege, and return to Mardonius with the remnants of his men.[139]