Arrian

“ But the men in the city stoutly defending themselves, and at the same time many from Halicarnassus having already come to their aid by sea, made it impossible for Alexander to capture Myndus by surprise or sudden assault. ”

“ About midnight, therefore, he approached the wall, according to the plan agreed on; but as no sign of surrender was made by the men within, and though he had with him no military engines or ladders, inasmuch as he had not set out to besiege the town, but to receive it on surrender, he nevertheless led the Macedonian phalanx near and ordered them to undermine the wall. ”

“ Siege of Halicarnassus.—Abortive Attack on Myndus.
Alexander now resolved to disband his fleet, partly from lack of money at the time, and partly because he saw that his own fleet was not a match in battle for that of the Persians. On this account he was unwilling to run the risk of losing even a part of his armament. Besides, he considered, that now he was occupying Asia with his land force, he would no longer be in need of a fleet; and that he would be able to break up that of the Persians, if he captured the maritime cities ”