After staying there for several days, the General resolved to march to Tivoli, which was held by a strong body of our volunteers. The column, consisting of 4700 infantry, two field guns and two smaller guns, and one squadron of cavalry, commenced its march at eleven o'clock. When we had gone a mile beyond Mentana the vanguard was suddenly attacked, and we had to fall back on Mentana, so as to form our battalions in line of battle. Recovered from our first surprise, the General ordered all the troops to advance, and we retook the positions we had lost, when, just as the Papal troops were retreating on the road to Rome, the French regiments, which till now had remained hidden behind the hills, out-flanked us on the left. After some very heavy fighting, especially in the position of the haystacks in the centre, which were taken, lost, and retaken, four or five times, the General, seeing the uselessness of contending against such an overwhelming force, gave the order to retreat. We retreated from the field of battle, passing under the fire of the Chassepôts, leaving between 400 and 500 men on the field, and about the same number of prisoners in their hands, and one piece of cannon. Two battalions, numbering altogether over 400 men, shut themselves up in the old fort of Munturra, where, having exhausted all their ammunition, they surrendered in the morning. When the main body had returned to Monte Rotondo, the General gave orders that every thing should be ready to re-attack in the night; but on examining the state of our army, we found that scarcely a cartridge remained, and not a single round of ammunition for the cannon. Learning this, the General gave the order to retreat to Passo Corese, where we arrived about one in the morning, being again on Italian soil. We then proceeded to the disbandment of our troops. At Mentana, where we had retaken all our positions, and where we thought the day was ours, we saw red-trowsered soldiers out-flanking us on the left, and we took them for the legion of Antibes, but the rapid roll of their firing opened our eyes to the fact that we were face to face with the French, armed with their new weapon, the deadly Chassepot, and from that moment we fought merely to save the honor of the day. There was no hope of winning the battle, though if the ammunition of our guns and rifles had not failed, and the General could have attacked again in the night, as he intended to do, I have no doubt but that we should have driven back the Franco-Papal army, for they did not dare to take possession of the positions which we held during the battle, and of the one gun which we left there, till late next day. Had they dared it, being so numerically superior, they could have cut us off and made us all prisoners, as their left wing almost touched the road running from Monte Rotondo to Passo Corese.