Moltke's plan more than hinted at a march on Vienna by the Semmering, and this is what is supposed to have induced La Marmora to treat it with scorn. With the bogey of Prussia vanquished before his eyes, he doubtless asked what the Italians would do at Vienna if they got there? He put the plan in his pocket, and showed it neither to his staff nor to the King, who would certainly have been attracted by it, as he had set his heart on the volunteers, at least, crossing the Adriatic. With regard to the campaign at home, both Moltke and Garibaldi counselled turning the Quadrilateral in preference to a direct attack upon fortresses which had been proved impregnable except with the assistance of hunger, and at present they were better provisioned than in 1848. The turning of the Quadrilateral meant the adoption of a route into Venetia across the Po below Mantua. An objection not without gravity to that route was the unfavourable nature of the ground which, being marshy, is liable after heavy rains to become impassable. But against this disadvantage had to be weighed the advantage of keeping out of the mouse-trap, the fatality of which needed no new demonstration. In Italy it is common to hear it said that it was necessary to station a large army on the Mincio to bar the Archduke's path to Milan. But apart from the rumoured existence of a promise to the French Emperor not to invade Lombardy, it was unlikely that so good a general as the Archduke would have taken his small army far from the security it enjoyed among the four fortresses which, if the worst came to the worst, assured him a safe line of retreat. The plan adopted by La Marmora is vaguely said to have been that which was prepared by the French and Sardinian staffs for use in 1859, had the war been continued. But in what it really consisted is not to this day placed beyond dispute. The army, roughly speaking, was divided into halves; one (the larger) half under the King and La Marmora was to operate on the Mincio; the other, under Cialdini, was to operate on the lower Po. It is supposed that one of these portions was intended to act as a blind to deceive the enemy as to the movements of the other portion; the undecided question is, which was meant to be the principal and which the accessory? The volunteers were thrown against the precipices of the Tridentine mountains, where a detachment of the regular army, well-armed and properly supplied with artillery, would have been better suited for the work. The Garibaldian headquarters was at Salò on the Lake of Garda. Less than half of the 35,000 volunteers who appear upon paper, were ever ready to be sent to the front. It was widely said that only patriotism prevented Garibaldi from throwing up his command, so dissatisfied was he with the conduct of affairs.