On coming back to this river, Alexander received a large reinforcement both of cavalry and infantry, sent to him from Europe, together with 25,000 new panoplies, and a considerable stock of medicines.[552] Had these reinforcements reached him on the Hyphasis, it seems not impossible that he might have prevailed on his army to accompany him in his farther advance to the Ganges and the regions beyond. He now employed himself, assisted by Porus and Taxilus, in collecting and constructing a fleet for sailing down the Hydaspes and thence down to the mouth of the Indus. By the early part of November, a fleet of nearly 2000 boats or vessels of various sizes having been prepared, he began his voyage.[553] Kraterus marched with one division of the army, along the right bank of the Hydaspes—Hephæstion on the left bank with the remainder, including 200 elephants; Nearchus had the command of the fleet in the river, on board of which was Alexander himself. He pursued his voyage slowly down the river, to the confluence of the Hydaspes with the Akesines—with the Hydraotes—and with the Hyphasis—all pouring, in one united stream, into the Indus. He sailed down the Indus to its junction with the Indian Ocean. Altogether this voyage occupied nine months,[554] from November 326 B. C. to August 325 B. C. But it was a voyage full of active military operations on both sides of the river. Alexander perpetually disembarked to attack, subdue, and slaughter all such nations near the banks as did not voluntarily submit. Among them were the Malli and Oxydrakæ, free and brave tribes, who resolved to defend their liberty, but, unfortunately for themselves, were habitually at variance, and could not now accomplish any hearty co-operation against the common invader.[555] Alexander first assailed the Malli with his usual celerity and vigor, beat them with slaughter in the field, and took several of their towns.[556] There remained only their last and strongest town, from which the defenders were already driven out and forced to retire to the citadel.[557] Thither they were pursued by the Macedonians, Alexander being among the foremost, with only a few guards near him. Impatient because the troops with their scaling-ladders did not come up more rapidly, he mounted upon a ladder that happened to be at hand, attended only by Peukestes and one or two others, with an adventurous courage even transcending what he was wont to display. Having cleared the wall by killing several of its defenders, he jumped down into the interior of the citadel, and made head for some time, nearly alone, against all within. He received however a bad wound from an arrow in the breast, and was on the point of fainting, when his soldiers burst in, rescued him, and took the place. Every person within, man, woman, and child, was slain.[558] [552] Diodor. xvii. 95; Curtius, ix. 3, 21. [553] The voyage was commenced a few days before the setting of the Pleiades (Aristobulus, ap. Strab. xv. p. 692).