From Havana.the American expedition — Grand review of the troops — the Efficiency of the men — the probable effect of a Federal victory upon the future movements of the expedition, &c.
From the New York Herald's special Havana correspondence, of November 22d, we extract the following: ‘ The Mexican expedition has not yet sailed, but I am satisfied that they are only awaiting the arrival of the arrogates Concepcion and Lealtad, which were to have left St. Thomas on the 20th, and therefore ought to be here within a day or two. If Miramon were on board, as some have suspected, we should have learned it by the English steamer. ’ On Tuesday last the troops intended for the expedition, together with some 10,000 more of the garrison here, were reviewed by the Captain General on the Paseo de Isabel II. About 16,000 men of all arms were on the ground, and made a very fine display.--The troops for Mexico wore their light blue cotton uniforms, with straw hats, and all were in marching order, with knapsacks, blankets, &c., strapped around them. The other troops were in full gala dress — snow-white linen coats and pants, black cross belts, and a small, light, serviceable shako, which I believe is peculiar to the Spanish army.--It was certainly a splendid body of men, better in appearance and discipline than any thing I expected to find. The only thing I noticed which I did not like was the condition of the arms, which were not as bright and neat looking as they might have been. The men march very rapidly, and carry their muskets in a manner different from what we are accustomed to see in the United States, and I believe more comfortably. While speaking of these matters, I may as well mention a rumor which prevailed here some days ago in certain circles, which was that if the United States were to gain some very decided advantage over the South, a victory which would promise success to the Northern arms, the Mexican expedition would be abandoned by Spain. No more idle rumor could exist. We have had news of the arrival of a Spanish vessel of war tendering Spanish aid to the Government of Yucatan, in men and money, to put down the Indians. I rather incline to the belief that the men and money will be sent probably in the shape of a detachment from Vera Cruz. I have the authority of the Diavio de la Marina for saying that the same offer was made by Spain to Yucatan some 16 or 18 years ago. But then and now are different times, and people might think such an offer now as rather suspicious, perhaps. On the other hand, I have been told that the indignation and alarm of the South American people increase every day, and that Gen. Paez has issued a proclamation inviting the Venezuelans to assist Mexico by every means to resist the Spaniards. This may possibly be true, but I do not choose to vouch for it without seeing the documents. P. S.--I had almost forgotten to mention that the steamer Santiago de Cuba is outside the harbor, watching, it is said, three or four suspected vessels now at anchor here. These vessels carry the English flag, and have cleared for Northern ports; but the supposition is that they are destined for some of the blockaded ports of the South.