Again, General Jackson's need for manpower at New Orleans explains the presence of the Louisiana Free Men of Color in the last great battle of the War of 1812. In the Civil War the practical needs of the Union Army overcame the Lincoln administration's fear of alienating the border states. When the call for volunteers failed to produce the necessary men, Negroes were recruited, generally as laborers at first but later for combat. In all, 186,000 Negroes served in the Union Army. In addition to those in the sixteen segregated combat regiments and the labor units, thousands also served unofficially as laborers, teamsters, and cooks. Some 30,000 Negroes served in the Navy, about 25 percent of its total Civil War strength. The influence of the idealism fostered by the abolitionist crusade should not be overlooked. It made itself felt during the early months of the war in the demands of Radical Republicans and some Union generals for black enrollment, and it brought about the postwar establishment of black units in the Regular Army. In 1866 Congress authorized the creation of permanent, all-black units, which in 1869 were designated the 9th and 10th Cavalry and the 24th and 25th Infantry. [Illustration: CREWMEN OF THE USS MIAMI DURING THE CIVIL WAR] Military needs and idealistic impulses were not enough to guarantee uninterrupted racial progress; in fact, the status of black servicemen tended to reflect the changing patterns in American race relations. During most of the nineteenth century, for example, Negroes served in an integrated U.S. Navy, in the latter half of the century averaging between 20 and 30 percent of the enlisted strength.[1-3] But the employment of Negroes in the Navy was abruptly curtailed after 1900. Paralleling the rise of Jim Crow and legalized segregation (p. 005) in much of America was the cutback in the number of black sailors, who by 1909 were mostly in the galley and the engine room. In contrast to their high percentage of the ranks in the Civil War and Spanish-American War, only 6,750 black sailors, including twenty-four women reservists (yeomanettes), served in World War I; they constituted 1.2 percent of the Navy's total enlistment.[1-4] Their service was limited chiefly to mess duty and coal passing, the latter becoming increasingly rare as the fleet changed from coal to oil.