A glance at the map will give the reader some idea of the doubts that must have beset Jackson concerning the point at which the enemy would probably attack New Orleans. The island on which the city stands was accessible from the sea by at least three general routes. The British might approach by the Mississippi River, which flows by the city on the west, or over Lake Pontchartrain, which stretches out to the north, or over Lake Borgne, from the southeast. Jackson first inspected Fort St. Philip, sixty miles below, on the river; besides the fort, there were, for river defences, the schooner Carolina and the sloop Louisiana. His next move was to Lake Pontchartrain, and he was still in that quarter when news came that the enemy had chosen the third route and was already on Lake Borgne. The British found there six American gun-boats, which were all destroyed or taken after a brief but gallant struggle. That was December 14, and New Orleans was not yet in any good posture of defence. The most natural route from the lake to the immediate neighborhood of the city was up the Bayou Bienvenu, which led to the southern end of a level plain bounded on the west by the river and on the east by a dense cypress swamp. At the northern end of the plain lay New Orleans, and the distance was but six or seven miles; the plain was in most places about a mile wide. Between the head of the bayou and the city there was not a fort or even a line of intrenchments. For this state of things Jackson has not escaped blame from military critics. But if illness or any other cause had robbed him of his usual energy, the news of the disaster on Lake Borgne was the signal for a change in him and in the situation. Coffee, with part of the Tennessee volunteers, was up the river at Baton Rouge. A hurried summons brought him a hundred and twenty miles in two days, and on the 19th he was in camp a few miles above the city with eight hundred men. Two days later came General Carroll and a brigade of Tennessee militia, two thousand strong; with them came also a squadron of mounted Mississippi volunteers. Louisiana furnished a thousand militia; the city of New Orleans five or six hundred volunteers, of whom about a third were mulattoes. Jackson had also two incomplete regiments of regulars numbering together about eight hundred rank and file. A Kentucky brigade of twenty-five hundred men was on the way, but without arms. Of Carroll's men, only one in ten had a musket. To provide arms for these new troops was a difficult matter, and many of the Kentuckians were still unarmed when the final struggle came. The city became panic-stricken and disorderly, and Jackson promptly placed it under martial law.